Welcome to lecture 15 and what we are going to do is continue the solution to the problem we were looking at yesterday okay and if you recall this was the differential equation which we had derived okay and remember this only represents the radial dependency of the velocity profile when you consider only the periodic part of the pressure gradient okay and this is in the limit of t tending to infinity. So now this is of course subject to the boundary condition that at r equals 1 we have h must be 0 and h at r equal to 0 must be bounded. This equation is a non-homogeneous equation because you have this minus 1 appearing here and therefore the solution is going to be in the form of a complementary function and a particular solution okay. So clearly we have h has 2 parts h particular and h homogeneous okay and now you just have to recall some of those things you did in mathematics when you were trying to solve differential equations without possibly having a physical basis you were doing it mathematically. Now you see an equation where you have a differential equation and then this has some physical meaning in the sense that it tells you something about a velocity okay. So let us go back and I think we will first calculate the particular integral this is the particular solution and clearly the particular solution is h equals 1 divided by i r omega because when I put h as 1 by i r omega r omega is a constant when I differentiate it I get 0 and I get minus 1 and that gives me minus 1 equals minus 1 everybody is happy okay but then I do not like to have this i in the denominator I want to put it in the numerator so I am going to multiply the numerator and the denominator by i and that gives me minus i by r omega okay. So this tells me the particular integral that is a particular solution. Now we need to look at the homogeneous version of the thing and the homogeneous version is 1 by r d by dr of r dh by dr and this is the homogeneous solution minus i r w h equals 0 this is the homogeneous equation corresponding to which I will get my 2 solutions my complementary function okay.  What am I trying to do? I am trying to define a new variable and get this equation in one of the standard forms that you have possibly come across earlier okay. The idea is when I do this transformation you will get a differential equation whose solution is the classical Bessel's function okay I mean that is just redefining of the scales. So how did I get this? I basically want a coefficient of plus 1 here. If I get a coefficient of plus 1 here this is going to collapse to my Bessel's function equation. So in order to get plus 1 here the denominator scale has r squared. So I am just saying r squared multiplied by this is a new variable. So when I do the write the differential equation in terms of r star I would get a plus 1 that is the objective.  So I just multiply throughout by i I get minus i squared is plus so r w comes here I guess that.  Motivation here is to reduce the ODE to a standard Bessel's function form okay and if I now instead of using r as the independent variable if I use r star as independent variable what would I get I would get 1 by r star d by dr star of r star dh by dr star plus h equals 0 okay this gets transformed to this okay you can work out the algebra it is not a problem. Now this has my classical solution which is the solutions to h is basically going to be some constant a multiplied by j0 the Bessel's function of r star plus some constant B times the other Bessel's function r star yeah there is an under root where yeah absolutely correct absolutely correct there is an under root there yeah thank you okay. Now this is your solution for the homogeneous part because I have just reduced it to the Bessel's function so I mean you guys have done Bessel's functions in cylindrical coordinates in your math course. So that basically I am just trying to tell you that the solution is the Bessel's function see since you are working in radial coordinates in polar geometry your solutions are in the form of Bessel's function if you have been working in the form of in a rectangular Cartesian coordinates you have got in sine and cosine your trigonometric functions okay okay what we are going to do is we are going to look at this function y0 y0 at r star equal to 0 is unbounded and what that means is if you were to retain y0 that means your solution is going to become infinitely large and since you have a physical problem you really cannot have an infinitely large solution or velocity. So this implies that the constant B must be 0 because B is non-zero then your velocity is going to be unbounded at the center point r star equal to 0 and you know that velocity has to be bounded in the middle okay. So we use this bounded conditions whenever we are actually seeking solutions analytically supposing you are actually seeking a solution numerically then you would use something like a derivative equal to 0 from a symmetry okay but you are actually getting a analytical solution then I have used this bounded argument okay. So they are kind of equivalent but not exactly but since when you are doing a numerical code you cannot say they cannot be infinity right you have to have some other condition. So what this means is I have h equals a times in fact this is remember the homogeneous part okay j0 of r star. So what is my actual this is the homogeneous part. So what is my actual h? My actual h is going to be the particular solution plus this solution which is –i divided by rw plus a times j0 of r star I am just going to go back to r now because I know r is going from 0 to 1 okay and instead of r star I am going to write this as square root of rw divided by i times r going back to this definition of this because I mean r is my physical quantity which I know goes from 0 to 1 okay. Our job is to evaluate a now and remember I have not yet used my other boundary condition I have already used up one boundary condition which is the bounded boundary condition and I have gotten rid of b. I have got to use the other boundary condition which is the fact that h at r equal to 1 is 0 and that implies h at r equals 1 equals 0 implies a equals i divided by r omega divided by j0 of square root of r omega by i r okay I have just moved it to the I put i is equal to 0 I put r equal to 1 and therefore that is going to be it okay because this is evaluated at r equal to 1 and that gives me what my constant a is. So I can now substitute the a value back here and get the h that I was actually interested in so the h is minus i by rw times 1 minus j0 of square root of r omega by i r divided by j0 of square root of r omega divided by i okay remember this only tells you this is my analytical solution which tells you how the radial dependency is now how do I but what I am interested in is actually my velocity right that is what we want to find out this h is only giving me a part of the thing how is my actual velocity defined the uz u1 I think that is what I used I am not sure u1 remember was the imaginary part of the exponential of times rwt times h of r is not this correct you need to check your notes and tell me if this is consistent with what I wrote earlier okay and so this is basically the time so this basically what you need to do in order to get the velocity is you need you found the radial dependency you have found the exponential dependency on time which we are assumed to begin with and now I have got h I am going to multiply that by to the i r omega t and I am going to calculate the imaginary part of it and that gives me my velocity and that gives me only one component of the velocity remember because there is the other component with the constant pressure gradient which gives you the Hagen-Boysel so I could add this component of velocity to that and then find my actual velocity okay this is u1 and the actual velocity is I mean u0 plus epsilon u1 is it something like this I am not sure what I used yesterday so I just want to make sure subscripts okay we will just use this as a subscript just to be consistent great okay so yesterday so this is just trying to be consistent with the thing so the actual velocity that you are going to get is going to be composed of two parts we found this as a result of the constant pressure gradient get your Hagen-Boysel parabolic velocity profile u1 is the imaginary part of this and then you multiply that by epsilon and you get your solution. So this is the analytical form of the solution what you can do is you can possibly go to one of the software packages like Matlab or Mathematica and plot the velocity remember it is a function of rw t and r okay so what you need to do is you need to decide what you are interested in. If you are interested in a specific value of rw you just fix it if you are interested in a specific position fix r and plot the velocity as a function of time and you can do this for different r's you can do it for different rw's that gives you your actual velocity now since this is a complicated expression one may want to say like can I get a simplified expression okay and I would not call it a simplified expression and an approximate expression and one way to do this approximation is to invoke the fact that rw can be either very large or very small okay. So now let us look at like we did yesterday look at the limit where rw is very small okay and now so this is the total solution this is the exact solution if you get u0 from yesterday and u1 from today and put it together but so yeah but what I have done is no this is with r equal to 1 it is a function of r yeah this is a function of r yes this is a function of r but this is a constant the denominator is independent of r the numerator has r and the way we define this is r not r star r star is the way we have defined it okay yeah so it is a function so this quantity here is a function of definitely r and the velocity will be a function of r, t and rw okay now okay can we approximate a solution which let us say maybe valid for low rw and when I say low rw I am talking about rw being very much less than 1 okay why would we be interested in okay one of the things I want you to do is sketch or plot plot okay this is a homework problem for you plot the velocity for fixed rw and r as a function of time so you have the expression now you just have to go and code it you need to go to the computer okay and then you need to go and solve and get the graph okay like this sketching a function you can do the same thing you can sketch the velocity for a fixed rw and t as a function of r so this I think there are many packages I if you have a fancy for a specific package you can use your package it does not matter okay but I need the result at the end of the day so I am comfortable with MATLAB some people are more comfortable with Mathematica some people say Maple anything is fine but the reason you need to do this exercise is we are going to approximate this result and then we want to check how good our approximation is okay clearly when I say low rw how low is low is it 10 power-5 is it 10 power-10 so that is the thing that you want to know right there are 2 ways of doing the of doing the approximation one is you can take this expression and you can possibly expand the Bessel's function in terms of a power series and then do the approximation that is one option or rather than work with the solution you start with a differential equation itself and depending on your choice you can do this okay so what we are going to do is we are going to go back to the differential equation and explain the method of finding the solution using a perturbation series okay because I think that is easier in some sense rather than you because you need to know the exact form of the expressions of the Bessel's function and then you have to apply it so for low rw we seek a solution in the form of power series in rw the idea is I am implicitly assuming the small changes in rw give me small changes in the velocity profile okay so what do I do I have h right h clearly is a function of rw and r okay h which is solution to this equation depends both on rw and r those are the 2 parameters what we are going to do here is we are going to seek this as a power series expansion in rw because rw is my small parameter and now the coefficients will all be functions of so this is like your Taylor series expansion or the power series expansion depending upon the level of accuracy that you are interested in you are going to keep the terms okay so now I am doing a power series expansion in terms of rw so the coefficients will be depending on the radial position r you understand so basically h remember the function of rw and r what I am doing is the rw is in the form of this power series the small r dependency on the independent variable is captured in these coefficients so our job is very simple if I am seeking a solution of this kind I expect that this series should satisfy my differential equation okay so I am going to have to substitute this series in my differential equation and like we did earlier we equate terms of the same order which means we equate terms of which are independent of rw rw to the power 0 which have rw to the power 1 which have rw to the power 2 okay and then I am going to get a sequence of differential equations and I use these differential equations I solve and I am going to get h0 h1 and h2 okay and once I get that I have a form and then I can go back and substitute it here your job is to verify how good is this approximation clearly if you take one term you will have an okay approximation if you take two terms you will have a better approximation to the actual value so what you are going to do is you are going to find the actual solution and you are going to find out how good this approximation is to the thing and that will clearly depend upon the number of terms you take okay. So for example maybe rw less than 10 bar-3 for example the approximation is good for first order but suppose you want to push it for larger rw value then you may have to take a second order term as well okay so just like you take more terms you get better accuracy.  So our strategy is now to find out h0 h1 h2 if I find out h0 h1 h2 I can substitute it here and I can find h. How do you go about finding h0 h1 h2 by equating terms of the same order okay. So if I look at terms of the order of r to the power 0 that is terms are actually independent of rw what do I get from this one I get 1 by r d by dr of rdh0 by dr okay and this will contain rw so I do not use this but this is independent of rw so I get equals-1 okay that is the differential equation which I get what about this guy to the power 1 clearly this is going to be contributed by this so I am only interested in the terms without the rw what I mean is I am not going to write the rw explicitly this gives me 1 by r d by dr of rdh1 by dr equals-i h0 plus this guy is this plus yeah when I am taking it to the other side of course it becomes plus yeah you are right I am taking it to the other side yeah it becomes plus i as 0 I am happy when you guys correct me because then I do not have to redo the lecture and the second one gives me this okay I was going to be plus i h2 no plus i h1 and so on and so forth what I want you to observe here is that we are solving a sequence of problems I solve for h0 h0 is known okay then I am going to now the right hand side becomes a non-homogeneity I solve for h1 we have a bunch of linear equations I solve for h1 then h1 is known I substitute it back here and I find h2 so this way I am able to proceed sequentially in my calculation and so once I know h0 h1 h2 I can substitute it back here and I have my solution h which is an approximation okay just want to make sure I have not made any mistake yeah I think everything is fine. So now in order to solve this we need to have boundary conditions because they are all differential equations anyway so what is the boundary condition on capital H capital H the boundary condition is that this should be 0 at r equal to 1 and so I am going to write it here the boundary condition is h at r equal to 1 equals 0 this implies h0 and r equal to 1 plus rw of h1 and r equal to 1 plus rw square times h2 of r equal to 1 equals 0 plus I have all the terms which I do not write okay remember I want this equation to be satisfied for any rw okay that is the idea when I am doing my power series expansion this has to be satisfied for all rw or any rw and this can happen only if h0 at r equal to 1 equals 0 h I should be more smart I should just say hi at r equal to 1 is 0 for all i and this implies so now I am all set because that is a very straight forward differential equation which we can solve and now since it is straight forward I will be bold enough to make an attempt okay and get the solution what we will do is we will try to get h0 and h1 I suggest you guys work it out on your own and then we can compare so or you can just follow me whichever way you are comfortable I will leave you to calculate h2 so how do you this is you can just directly integrate and get the solution h0 okay 1 by r d by dr of r dh0 by dr equals minus 1 I can take the thing over there and integrate this out I get r dh0 by dr equals minus of r squared by 2 I have r dr I take the r here integrate this with respect to this thing I integrate this once I get a factor constant c1 okay integrating once once with respect to r so I take the r there and do this integrating one more time but then I before that I am going to bring my r below okay and I get dh0 by dr equals minus r by 2 plus c1 by r integrate again what do you get h0 equals minus r squared by 4 plus c1 log r plus c2 okay so these are the constants which I have to evaluate I know that at r equal to 0 my log term becomes unbounded so I use the same argument as last time I say c10 since log of r at r equal to 0 is unbounded and I only have to evaluate c2 and that comes from a condition at 1 okay and the c2 is therefore equal to at r equal to 0 I have h0 equals at r equal to 1 I have h0 equals 0 and I have c2 is therefore 1 by 4th and this implies that h0 is 1 by 4th of 1 minus r squared so in some sense you can h0 corresponds to what the solution when rw is 0 okay h0 corresponds to the solution when rw is 0 when there is no omega remember rw is omega something multiplied by r squared divided by nu so that means there is no periodic part you can think of and so the solution is that only due to the constant part and you get your parabolic velocity profile and basically this is what we always try to do whenever we are doing a perturbation series solution when I am trying to expand it in terms of a particular parameter I want to make sure that when the parameter is 0 I have a solution okay and then I am trying to improve on the solution for nonzero values of the parameter okay so when rw is 0 I am getting a solution when rw is not 0 is some small finite value I am going to tell you the solution is going to be different and that difference the correction is incorporated in that rw h1 term okay and h1 is what we have to calculate now so depending on your level of accuracy you take more terms so now that I know h0 which is here I am going to substitute it in this equation and I am going to solve for the h1 okay I have 1 by r d by dr of r dh1 by dr equals i multiplied by 1 fourth of 1-r squared this is the governing equation for h1 I am just going to put that I think I am fine okay so now I can make space clearly this is a function of r and you know how to integrate this and you can get h1 now okay so I am just going to integrate this with respect to r again and what do I get d of r dh1 by dr I am integrating that equals i by 4 just doing it a little bit of a stepwise manner to reduce my chances of making a mistake and so this gives me r times dh1 by dr equals 1 fourth of i I get r squared by 2 and I get-r to the power 4 by 4 okay plus a constant of integration c1 okay all I have done is just taken this r dr to the other side and I am just integrating it I am going to do exactly what I did last time divide throughout by r r by 2-r cube by 4 plus c1 by r integrate this one more time to get h1 equals i by 4 times r by 2-r cube by 4 plus c1 something is wrong and I get r squared by 4 and r to the power 4 by 16 plus c2 same argument as last time I knock off c1 okay and I need to calculate c2 and I am going to use the boundary condition that h equals 0 at r equals 1 and get c2 okay let me just do this and r equals 1 h1 is 0 okay this implies-i by 4 times 1 by 4-1 by 16 let me just do this because equals c2 right and I have what 3 by 4 3 by yeah 4 by 16 is that right there is a 4 here yeah so 4 by 48 right equal to c2 16 4 or 64 yeah right that is it so that is my h1 is i by 4 you can write it whichever way you want some people like to write it in a different way 16-3i by 64 you can possibly write it in a slightly better way this is slightly clumsy I called i occurring a couple of times you can take things common and you can simplify things okay. So now if you wanted to get a more accurate solution go and get h2 but you can see that this is a very simplified way of getting the coefficients of rw what are you going to do now you are going to actually go back and h is now a composite h0 plus rw h1 I want you to see that h0 is independent of i the imaginary number h1 has i in it so what is it going to do you go back to get the velocity you have to do the imaginary part of the exponential e power i rwt multiplied by the h so this guy is going to be exponent that is the real term the exponential of that is going to give you your cos theta plus i sin theta so the imaginary part is going to give you only the sin theta which means that particular component is actually in phase so when rw is 0 your velocity is actually in phase with the pressure gradient whereas when rw is not 0 a small amount comes in the i comes and now when you actually take the imaginary part instead of the sin term you will also get a cosine term because now it is exponential of i theta multiplied by i something so the imaginary part will have the cosine term now okay. So this is going to give you that out of phase component of the velocity so I mean that is one way for you to actually figure out why when you have a finite value of rw you have an out of phase component so I think this becomes very clear here so this is something which you should I will let me write this down so clearly u is the imaginary part of e power i rwt times h0 plus rw h1 okay I mean I am neglecting all the higher order terms so this is the imaginary part of what cosine rwt plus i sin rwt multiplied by h0 plus rw remember rw actually has no sorry rw does not have it h1 point I am trying to make here is h0 is real so this multiplied by this is going to give me real part I am not interested in that this multiplied by this gives me the imaginary part. So this is going to be of the form this is of the form sin rwt multiplied by h0 okay so this h0 is contributing to my in phase part so this is in phase this is in phase what about this guy when this remember has the i in it so i multiplied by this is the real part so I am not interested in that i multiplied by this gives me the imaginary part which is the cosine part so this is basically going to have a cosine component times something okay some function of r so this gives you the out of phase so what I am trying to tell you is and remember this is multiplied by rw so this is the out of phase part so in rw is very very low the out of phase part will go off the more the rw the more the out of phase component okay so that is basically for you to understand so what you people will be doing is actually finding out the solution using this approximation finding out the solution using the exact solution and making a comparison just like you know what we did for the quadratic equation the quadratic equation you have the exact solution in terms of the discriminant then you have the binomial series expansion all the all the power series that we actually did and then you can compare from how accurate is this thing for a different epsilons the only when you do that you will get an idea because I am saying epsilon is low I am saying rw is low but how low is low that is going to depend upon the problem upon the specific problem for some problems rw may be low as 10 for some problems rw low could be 10 power minus 5 so how do you figure that out only by doing this comparison so how good is your perturbation series solution and because if it is very very low then possibly this approach is not very good but supposing retaining the two terms I am able to push to rw equals 5, 10, 50 the more the better then I am happy with it okay but then this can only be done when you actually sit down and do an actual calculation so that is what you people are going to do do an actual calculation and then verify how low is low I think one last thing I want to do and then we will stop somewhere in the beginning I chose my time scale as r square divided by the kinematic viscosity okay I want to go back to making the equation dimensionless okay and I told you that there were 2 possible choices of making the equation dimensionless because we had 2 choices for the time scale okay what was the equation we had to t equals g0 1 plus epsilon sin omega t plus mu by r d by dr of r du by dr that is the equation we began with okay I mean assuming that they have only the actual component of velocity only varying r and t I am going to just I am going to keep the velocity scale and the length scale the same okay because length scale clearly r there is nothing else happening and velocity is going to be decided by the pressure okay but if we choose the time scale the characteristic time as 1 by omega instead of r square divided by nu this is what we did earlier r square divided by nu is what we did earlier what you are going to see and I am just going to write this here you will have and you can do this okay keep all other scales the same you would get in a dimensionless form t the following equation the following equation equals okay. So you know by choosing a different scale I just wanted you to understand that I told you earlier that the scales can be chosen in different ways I am choosing it this way now the advantage of so anyway there is one parameter which occurs it is not that this rw has disappeared one parameter will occur and this again the ratio of the same time scales okay this guy now is multiplying my inertial term now it is possibly easy for you to see that when rw is 0 when rw is very very low the inertial component is not going to be significant in my earlier formulation I could not see that now I can see that when rw is 0 this guy is going to get knocked off okay. So when rw is 0 this guy goes off and remember this was the guy who was creating a problem with the outer phase component if this goes off then I can actually solve for the velocity and I can get my velocity directly okay. So basically what I am saying is here in this formulation here rw equal to 0 knocks off the inertial term and so the velocity is in phase with the delta p. So possibly by doing this scaling you can instead of solving it and then trying to understand whether it is in phase or out of phase even by looking at the differential equation you can actually make this conclusion. So whenever you are solving any problem you need to be able to actually work out by choosing different time scales and see what kind of information you are getting okay because a lot of information by choosing the right scales or different scales and that will give you some insight into the problem okay. Yeah let us stop thanks.


Well, the reason that I joined the Air Force was honestly I was just really bored with my civilian life I had just graduated from college and I was eager to get into the next chapter of my life But I didn't know where that would be and I actually turned 27 while in boot camp. I Just completed eight years time in service and I am a staff sergeant My AFC is for Alpha zero X one that is health services management And I'm currently on a special duty as a patient movement controller for TPM RCE Actually, neither I came into the Air Force as a tack P and actually was medically eliminated from the course and other Battlefield airman jobs when that happens sometimes they grant you the opportunity to reclass so they have you fill out a dream sheet And it just so happens that I was reclass from that into the for a career fields and actually the majority of the male Four a's ended up in the career field the same way that I did Absolutely not the last thing that I wanted to do was end up behind a desk in the military But once I got to my first duty station, I was actually put into the readiness flight as a unit deployment manager I had a great supervisor my position in the unit was really great And I got a real understanding for everything that we do to support the people downrange and I was actually really good at my job Well, like I mentioned earlier, I wanted to be tack P and whenever they have you fill out that dream sheet for a reclass One of the jobs that I put down was combat photographer. I also was interested in public affairs I just wanted to be as far forward to the battlefield as I could Actually signed up for six years That was a requirement to get the enlistment and bonus that was offered in the tack P career field When I was reclass I actually lost that but I'm glad that I did sign up for six years because it worked out for me in different ways Tech school for the for a career field is actually at Fort St. Houston in San Antonio, Texas It's actually pretty quick all of the Air Force medical tech schools are actually located at Fort St Houston and in comparison to them You're in and out and they actually call you a pop tart because you get there and in about 30 days later Most of the people take off now for me. I got there during the holidays So I took part in what is called as exodus That's actually where you leave the squad room for the holidays go home and then come back If you actually are there during that time I recommend that you go ahead and take leave go home because if not You're just gonna be doing details till everyone comes back and classes start again No, absolutely not I hated it 27 year old man sleeping in a twin bed I was over it pretty quick. The great thing is the facilities are all brand new. They're very very nice Their state of the art for most people they didn't probably didn't mind it that much But I was just over it after bootcamp. I actually got there with my face to already completed So that meant that I got to leave the squadron on the weekend So come Friday after we release I would leave and I'm from Texas So I had a lot of friends in San Antonio So I just stayed with them until Sunday night when you're required to be back at dorms So that was the saving grace for me was being able to leave on the weekends Actually everywhere you can get assigned to not only the Air Force bases But all of the other US military bases as well You can actually get assigned to embassies and anywhere that has a medical detachment wanting to travel the world Medical is the way to go Now the for a career field is actually very broad So what I'm gonna do first is talk about the traditional roles in the clinic And then I'm actually gonna discuss a little bit about what I do right now at my special duty Now a for a can find themselves anywhere in the clinic That's why I describe them as the Walmart of the medical support staff You can find a for a over in CSS the command support staff You can actually find them over in referrals systems readiness Records flight medicine or the front desk now currently. I am a PMC that stands for patient movement controller I am part of a geographically separated unit or a GSU the unit that I'm attached to here at Ramstein is TP M R C E that stands for transcom patient movement requirement center east I know it's a lot of acronyms We're actually tri-service which means that we have Navy Army and Air Force personnel our home unit is Scott Air Force base Back in the States, and that's transcom now TP M R C E has three areas of responsibility That means that we cover all patient movement for you come Africa and st. Com so if a military member or DOD civilian becomes ill or injured in any of those areas We actually are responsible for their patient movement, which covers about 80% of the global patient movement So as a PMC my primary job is to review all patient movement requests So I ensure that all of the admin information in there is correct, and it's validated now TP M R C E works with multiple Organizations to coordinate the aircraft that is used the team that is deployed and the areas or hospitals that these patients are Going to be picked up at and delivered to Now the traditional schedule for a 4a is just like a civilian clinic. That's Monday through Friday 7 to 5 now my current unit We're on what is known as a Panama schedule, which is 24-hour operations Roughly a 12 to 13 hour shift. Now the great thing is you only work about 15 days out of the month, which means that you work two days You're off three then you work three days, and you're off two Now like I mentioned before the for a career field is actually very broad But you can get special codes attached to your AFSC which allow you to remain in a specific shop for the majority of your for a career field now. These are known as SEI codes or special experience Identifiers two shops specifically that I have SEI codes in is systems and readiness Now in order to get these codes you have to get additional Certifications and training for instance in systems since it is on a different network than the base Systems personnel have to get the same certifications at the base com personnel have to So if you really like computers and system and networking that is one option that you can do now each of those actually Transition into the civilian world wonderfully, and you can line yourself up with a job before you even get out Now the deployment tempo for a for a is just like the rest of the medical personnel But deploying as a for a is actually very very rare if you were to deploy as a for a you would be deployed as Part of a pad team or patient administration team. Those are usually located at the larger hospitals Over in the AOR now traditionally a for a is actually going to deploy more often as a TCN escort A TCN escort is actually a third country national And those are personnel that are hired by the military In a different country to perform certain duties and your job would be to superify those those personnel At the very least that would be your job. Now a more common deployment for a for a is for humanitarian purposes Such as going to a certain location because of a natural disaster, but deploying as a for a that's actually pretty uncommon nowadays Honestly, I'm not sure. I'm still really just playing it by ear there's a lot of things that I want to do before I hang up my dog tags and Every year that I complete is closer to that 20 year mark and those benefits start to look really tempting So at this point in time the jury's still out. I don't know Now my ultimate goal is to commission now originally I wanted to commission into the medical services core or MSC Which is actually our officer counterpart, but that has a time-in-service cutoff that I already broke So unfortunately unless that changes I'm still gonna go with just going kind of open general on the officer side Now my advice for a person that wants this job coming into the Air Force is if you want this job or any job In the Air Force pursue that don't allow yourself to be pressured by the recruiter by anyone else If you want a specific job stick to your guns and go after that job They may tell you is like oh, but you can leave earlier or you're gonna have to wait Longer for this job do whatever it takes to make sure that you get that job Now you may be in a time crunch kind of like I was and at that point If you have to go in and get a job that you weren't passionate about or wanted in general Wait till you have your cross-training window and go ahead and at that point apply for that job But not all jobs allow you to cross-train So before you take any job make sure that you have that possibility available to you now My advice to you to be successful in the military is to be patient and to keep a positive attitude That's gonna be very important and it's gonna go a long way in your military career Now all military jobs in the end are still just jobs So that means that they're probably gonna become monotonous at some point in time Commit yourself to a process improvement give yourself a personal and a professional goal and your motivation to succeed and achieve those things We'll find its way into the rest of your career and the rest of your life Well guys, I want to thank you for this opportunity to talk to you about a little bit about my career field and what I do on a Daily basis you guys can find me on multiple social media platforms But the quickest and most efficient way to find me would be go to Facebook Look up wild at heart association and when you see the white star, you know, you found the right spot Now that'll connect you to Instagram that'll connect you to YouTube Twitter all the other social media platforms that we're on Thank you guys for this opportunity and you guys have a great day


Hey, man, so keep your place there in John chapter one. So we're going to start a new Bible study through the book of John this evening. We're starting in John chapter one. We're only going to get through about verse 14 this evening because I really want to focus on the first part of this chapter. Now, I will often send people to the book of John who have just started reading their Bible. The book of John, of course, is one of the Gospels and it's the Gospel that focuses the most on Jesus being God. Many of the Gospels focus on different things, but the book of John really focuses on the deity of Christ and who Jesus really is and that's the title of the sermon this evening as we look through the first couple of verses in the book of John is Who is Jesus? Who is Jesus is what we're going to look at in depth tonight and hopefully I can show you as we look through these first few verses in the book of John, I can show you the importance tonight of reading your entire Bible. As you'll see, as we go through these verses in the book of John, there's cross references all over the Bible on who Jesus actually is from Genesis all the way to Revelation. So that's what we're going to look at this evening. I'm going to give you two pairs of things that Jesus is from John chapter one in these first few verses. So let's start reading. Let's look down at John chapter one. The Bible says, in the beginning was the Word and the Word was with God and the Word was God. So right away, if you've read through your Bible and you've read the Bible cover to cover, you see something familiar there where the Bible starts out in John chapter one saying in the beginning, just like the Bible starts out with those three words and we're going to look at that in just a minute, but the Bible says in the beginning was the Word. It doesn't mean the beginning of this time. That means the beginning of the creation. In the beginning was the Word. The Word, you just notice these two words that are together three times in verse number one. The Word, the Word, the Word. So in the beginning was the Word, meaning the Word was there before the creation. The Word was with God. So the Word was there with God and the Word was God. So a lot of people don't believe that Jesus was God. Here it is, right here pointing out that Jesus is God. Look at verse number two. Look at verse number two. The Bible says in verse number two it says the same meaning, what is the two words the same in verse number two refer to? The same means is referring to the Word that we saw three times in verse number one. So it's saying in the beginning was the Word and the Word was with God and the Word was God. The same referring to the Word that we just talked about in verse number one was in the beginning with God. So again, he just is repeating this again to get the point across. The Word of God is getting the point across that the Word, whatever that is at this point we don't know yet because we have to keep reading, but this Word was in the beginning with God. It was there. Okay? Look at verse number three. All things, now we see something new in verse number three. It says all things were made by him. Who is him? Him is the same. Him is the Word. This is what we're talking about here. So it's saying that the Word was in the beginning, the Word was with God, the Word was God. The same is talking about, again it says, referring to the Word, it was in the beginning with God, kind of repeating something there. And then all things were made by him, all things were made by what? By the Word. And without him was not anything made that was made. So the Word equals him in verse number three. Okay? That's what I'm trying to get you to see. Now turn to Genesis chapter one. Now turn to Genesis chapter one. So the first pair, we're talking about, who is Jesus, all right? We know in coming verses, I'll just give it away for you, the Word here is Jesus. The Bible explains that to us in verse number 14, but this Word is Jesus and the Bible here is saying that Jesus is the Word. So the first pair of things that I want you to see tonight is that Jesus is the Word and thus the Creator. Jesus is the Word and thus the Creator. That's what the Bible is saying in verse number three. It says all things were made by him, the Word. Okay? Look at Genesis chapter one. You're saying, what, Jesus was the Creator? I thought God created the world. Look at Genesis chapter one and I'll explain that to you. Look at how the Bible starts out. The Bible starts out in the beginning, just like John chapter one starts out. In the beginning, God created the heaven and the earth. Verse number two. And the earth was without form and void.  And God said, let there be light and there was light. So the first thing that I want to point out here is that, you know, God is the Creator, but there's two things that you need to understand. The first thing is this, the world was spoken into existence. You'll notice this pattern of wording in Genesis chapter one in the creation story where, you know, this is the first day we're talking about, but when God creates something it says, and God said, let there be light and there was light. So God created the world with what? With His words. He literally spoke the world into existence. And that's how we can say that the word was God, the word was with God, and in the beginning was the word. And we can also say that this is how Jesus created the world. Go to Colossians chapter one. Go to Colossians chapter one. You're going to keep your place in Genesis chapter one and in John chapter one. We're going to keep bouncing back between those two things. But go to Colossians chapter one and let's look at verse number 13. Go to Colossians chapter one and look at verse number 13. Colossians one verse number 13. We're looking at this idea of Jesus as the word and thus the Creator of everything. Look at verse number 13 where the Bible says in Colossians chapter 113, it says, Who hath delivered us from the power of darkness and translated us into the kingdom of His dear Son. This is talking about Jesus Christ. In whom we have redemption through His blood, even the forgiveness of sins. Who is the image of the invisible God talking about Jesus, the firstborn of every creature. Now look at verse number 16 where it says, For by Him were all things created that are in heaven and that are in earth, visible and invisible, whether they be thrones or dominions or principalities or powers, all things were created by Him and for Him. And He is, and this matches perfectly with John chapter one, two and three. John chapter one verse one, two and three. And He is before all things and by Him all things consist. Jesus is the way God the Father created everything. He's the mechanics of how it happened. It was literally spoken into existence, you say created what? Everything. I mean the Bible says all things were created by Him, thrones, dominions, principalities, powers, gravity, every law of physics, every single thing that we try to search out in this world was created by Jesus Christ. By God speaking His word and Jesus Christ being that power, that word that created everything. Jesus is the spoken word of God is what the Bible is telling us here. That's who Jesus is. And thus this is how God created the world. People say how in the world could, you know, God have created everything. He spoke it into existence. His word has power. His word is Jesus. Jesus is the word of God and thus the Creator. Turn back to John chapter one. You're going to keep your place in Genesis chapter one. There's a lot of interesting things we're going to keep looking back at Genesis chapter one. But the second pair of things. So the first pair of things we see is that Jesus is literally the word of God. He was, He is God and He is in the beginning with God and He was the mechanism. He was the way that God created everything, everything, the universe, all the laws, the principalities, the dominions, everything that we see today. Look at John chapter one and verse number four. John chapter one, look at verse number four. The Bible says this. The Bible says, in Him was life and the life was the light of men. You're like, okay, that's a nice saying. And the light shineth in darkness and the darkness comprehended it not. The second pair of things that I want to talk about this evening that Jesus is, is Jesus is the light and the life. So Jesus being the word goes with Jesus being the Creator and Jesus being the light goes with Jesus being the life. Okay, you say, what are you talking about? Turn to John chapter eight. We can't even go to all the verses in the Bible to talk about Jesus being the light. Okay, but we're going to go to a few just to show you that it's a common thing in the Bible. So what does that mean? Is this a spiritual application? Look at John chapter eight and look at verse number twelve. John chapter eight, look at verse number twelve. The Bible says, then Jesus, then spake Jesus again unto them saying, I am the light of the world. He that followeth me shall not walk in darkness, but shall have the light of what? The light of life. So we see that the light goes with the life. Look at John chapter nine, just one chapter over and look at verse number five. Jesus says again in John chapter nine, look at verse number five, Jesus says as long as I am in the world, I am the light of the world. So Jesus here is talking in a spiritual sense, that he is this spiritual light of the world. I mean look, in Isaiah chapter nine, I'll just read it to you. Darkness, darkness is salvation is light compared to not being saved, being spiritual darkness. Okay so that's the case that Jesus is using here, talking about being that spiritual light. In Isaiah nine two, the Bible says, the people that walked in darkness have seen a great light. They that dwell in the land of the shadow of death upon them hath the light shined. This is talking about people that are not saved, this is a prophecy of Christ. People that are not saved are walking in the darkness in the shadow of death. Why? Because John 3, 36 says that the wrath of God abideth on them. People that have not believed on the Lord Jesus Christ, have not trusted on Jesus, have the wrath of God upon them. It's like a great weight, a great shadow of death sitting upon them. Jesus is that light. When you believe or trust on Jesus, that light shines and takes that shadow of death away. That's what Jesus is talking about in John chapter 8 and John chapter 9 saying, I am the light of the world. Turn to Matthew chapter 5. In Psalm chapter 119 verse, actually you turn to Psalm chapter 119 verse number 105. Turn to Psalm 119 verse 105. What is Psalm 19 about? The longest chapter in the Bible. It is all about what? It is all about loving, studying and dwelling and pondering on the Word of God. Psalm chapter 119 is all about Jesus. Because Jesus is the Word. Look at Psalm chapter 119, look at verse 105. Now that you know that Jesus is this light that removes the shadow of death from those that have trusted on him, look at Psalm 119 verse 105. Hopefully you see how the Bible just completely perfects itself. It fits together. There's no way this could have been written by dozens of different people that just were trying to figure this out. I mean, it's a miracle in itself. Look at verse number 105 of Psalm 119. The Bible says, thy Word. Who is thy Word? David is talking, the psalmist is talking to God. He's saying thy Word, Th, singular. He's talking to the Lord. He's saying God's Word. Who's God's Word? He's talking about Jesus. Is what? Is a lamp unto my feet and a what? A light unto my path. I mean, it makes perfect sense. Jesus and a light are completely interchangeable in this verse. Look at Matthew chapter 5. Now it's interesting because the Bible also says, Jesus also says that once you're saved, you also have a light. You also have a light through what? Through His Word, through Jesus. Look at Matthew chapter 5. Look at verse number 16. Matthew chapter 5, look at verse number 16. The Bible says in Matthew 5, 16, it says, let your light so shine before men that they may see your good works and glorify your father, which is in heaven. So the Bible says that once we are saved, we have a light. Look at Ephesians chapter 5. Ephesians chapter 5. Ephesians chapter 5, look at verse number 8. Ephesians chapter 5 and verse number 8. The Bible says, for we were sometimes, for we were, ye were sometimes darkness, but now are ye light. Who's he talking to? He's talking about the church at Ephesus, talking about these Gentiles who got saved by believing on Jesus. And he's saying, you were in darkness. He's like, but now are ye talking about them? He's like, you are light in the Lord. Walk as children of light. He's telling them to go out and preach the Word of God, is what he's telling them to do. Walk as children of light.  That word, that word of God. So it's all responsibility to go out and shine that light, which is what? The word of God, preaching the gospel of Jesus Christ, is what we're referring to here. So we see that Jesus is this great spiritual light that shines through the darkness. It shines through the shadow of death. It shines through the wrath of God. Here's what's really interesting. Turn to Revelation chapter 21. So we see that Jesus is talking about, John chapter 1, is talking about Jesus being a spiritual light. But did you know the Bible also says that Jesus is a physical light? Like he's physically light. Light that shines so we can see stuff. It's super interesting. Look at Revelation chapter 21. Revelation chapter 21. All right, so let's get some end times context as we go to Revelation chapter 21. You've got to remember your clues and milestones sermon series now. Revelation chapter 21, we are talking about the New Heaven, the New Earth, and the New Jerusalem, specifically here in Revelation chapter 21. But what has happened so far? What has happened so far? So if we go all the way back to the beginning of the end times, what has happened so far? Let's just review the whole sermon series in three minutes here. Let's do an end times review in three minutes. So basically, this guy showed up that was predicted in the book of Daniel. This guy called the Antichrist. There's many Antichrists. Anybody who's against Christ is an Antichrist. But the Antichrist shows up who makes a covenant with many in the book of Daniel prophesied. This is Daniel's 70th week. He comes, he makes a covenant with many. He sets up the abomination of, actually, he makes a covenant with many. Then in Revelation chapter 6, there's this huge war where he turns his covenant with many into a one world government. Revelation chapter 6 details how that happens. And then we get to Revelation chapter 13 where we see that now there is this one world government. There is all the kings of the earth that are following this Antichrist. And he sets up what? He sets up this image in the temple. He forces people to worship this image. He makes people take this mark in their right hand and in their forehead. And anybody that doesn't take the mark and worship the image, he hunts down and kills. And this is what ushers in in Matthew chapter 24. This is what ushers in the great tribulation. You're like, how will we know it's the great tribulation? Because there are several milestones that have happened. This guy, the Antichrist, has come on the scene. The abomination of desolation has happened. It's not like we're going to miss the mark of the beast. Like all the people saying, oh, the vaccine was the mark of the beast. And I'll say, no, no, no. These may be shadows of things to come, but the mark of the beast is going to be specifically something the Antichrist puts in place to worship this image that's in the temple. So we can watch for these milestones. This ushers in the great tribulation. How will we know it's great tribulation? Because the Bible says in Matthew 24, it'll be worse than any tribulation that's ever happened on the earth to this point on Christians. Look, that's bad. If you've read about things that have happened to Christians throughout history, from the Jews, from the Romans, from the Catholics, for all the way through the last 2,000 years, it's some terrible stuff. You've got to read it in doses. It's so bad. There's a part in the Marker's Mirror, in this book, right here. There's a part in this book where it literally says that things were getting so bad underneath some of these Roman emperors that it's like the imagination of men was empty because every evil imaginary thing that men could imagine to do to another man was being done. The Bible says the great tribulation will be worse than all that. We're not going to miss that. It's not going to be like, oh, are we in that now? Christians are going to be running. They're going to be hiding. And the Bible says, unless those times, those days are shortened, it's like no one would make it through it. And of course, those days are shortened by what? The sun and the moon are darkened. Matthew chapter 24, Revelation chapter 7, Revelation chapter 14, and the rapture happens. So God does cut those days short. He's going to rapture the believers from the earth at that time. And after he raptures the believers from his earth, literally one hour later, he is going to start pouring out his wrath upon everybody that's left on the earth. So it's at that midpoint of Daniel's 70th week, right at that three and a half year period that the rapture is going to take place. We're out of here. Look, there's going to be tribulation that we're going to go through before that. But God will end it at some point during the great tribulation. He raptures the church. And then we see in Revelation, we see the seven trumpets and the seven vials of God's wrath being poured out on the earth for three and a half more years. After this, what do we have? After God's wrath is poured out, we have the battle of Armageddon in Revelation. We have the battle of Armageddon that happens. And right after that battle, what do we have? We have the millennial reign of Christ. Christ, we come back with Christ, and we rule and reign with Christ for 1,000 years. That's going to be a good time, all right? The Bible says that that's going to be a wonderful time. Basically, Jesus is going to come back and say, hey, here's how it's going to look if you had done it how I told you. Here's how things will go if you follow the word of God, which is what? Me. So Jesus is going to rule and reign for 1,000 years. After that, we have the great white throne judgment.   And what are they going to get? They're going to get what they wanted. They're going to get to be judged by their works. And God is going to judge every one of them by their works. Because isn't that what people want today? People that aren't saved today, what do they think? They think they're pretty good. They're going to find out how good they are. They're going to pay for everything that they did.  And the beast, the false prophet, Satan, they're all going in the lake of fire at that point. And then we have Revelation chapter 21. We have the new heaven and the new earth. All the end time stuff is there. I mean, the end time stuff is really not that complicated. The chronology of it, unless you throw in a bunch of weird doctrines that aren't in the Bible.  So after that, we have the new heaven and the new earth. And this new Jerusalem, this beautiful city, is what we're seeing in Revelation chapter 21. Look at verse number 17. We have this beautiful city. Everything is done. The end times, the wrath is over. We have the new heaven, the new earth. The Bible is just giving us the measurements of the new Jerusalem. It says you measured the wall thereof, 140 and 4 cubits, according to the measure of man, that is, of the angel. And the building of the wall, it was of Jasper. And this city was pure gold. Can you imagine? Like under clear glass. The foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was Jasper, the second Sapphire, the third Chalkadoni, the fourth and Emerald. The fifth Sardonyx, the sixth Sardius, the seventh Chrysalite, the eighth Beryl, the ninth Atopaz, the tenth a Chrysophorus, the 11th, the 12th, and Amethyst, Amethyst. In verse number 21, the 12 gates were 12 pearls. Every several gate was of one pearl. And the street of the city was pure gold, as it were transparent glass. And I saw no temple therein. For the Lord God Almighty and the Lamb are the temple of it. Who's the Lamb? That's Jesus. And the city had, now this is what I really want to point out to you this evening. The city had no need of the sun, neither of the moon to shine in it. For the glory of God did lighten it and the Lamb is the light thereof. And the nations of them which are saved walk in the light of it and the kings of the earth do bring their glory and honor into it. So we have the new heaven, the new earth and this beautiful city and the light. There is no sun. The stars, everything fell out of the sky. You know, during the wrath of God you know, rolled up as a scroll but Jesus, the Lamb, is the physical light of the city. Jesus lights the city himself. You say, what? How does that work? How does that work? Well, turn to Genesis chapter one. Turn to Genesis chapter one. So Jesus is a spiritual light. We see that, you know, I mean the Bible says in John chapter one, you know, that he's the light of the world. It doesn't say like he's the spiritual light only of the world. The Bible here is saying Jesus is the light. Jesus said, I am the light. We get that that's a spiritual light but I'm telling you, Jesus is also a physical light. He's providing physical light in Revelation chapter 21 at the end of everything. But here's another interesting point. Look at Genesis chapter one. Look at verse number two. Genesis chapter one and verse number two. The Bible says, now verse number two is wait after the earth was created. We're talking about the first day of creation here in Genesis chapter one, verse number two. And the earth was without form and void. God hasn't made everything yet. He's just made the heaven and made the earth. And what? Darkness was upon the face of the deep. And the spirit of God moved upon the face of the waters. And God said, let there be light and there was light. Now go to verse number 14. Now go to verse number 14. So we see that light was the first thing that God put on the earth. But here's what's really interesting. You look at verse number 14. The Bible says, and God said, let there be lights in the firmament of heaven to divide the day from the night. And let that be for signs and for seasons and for days and for years. And let them be for lights in the firmament of heaven to give light upon the earth and it was so. And God made two great lights. The greater light to rule the day. This is what we would call the sun. And the lesser light to rule the night. This is what we would call the moon. He made the stars also. And God set them in the firmament of heaven to give light upon the earth. And to rule over the day and over the night and divide the light from the darkness. And God saw that it was good. And the evening and the morning were, oh, look at this, the fourth day. So the Bible says that God created light on the first day, but the sun didn't exist until the fourth day. So the question is, where did that light come from? It came from the word. It came from the same place that it comes from at the end. It came from Jesus. Who was what? Who was there? Who was there at the beginning and was there creating everything. That light was Jesus. Jesus was there on the first day. That's where the light came from. The sun wasn't even created yet. Isn't that interesting? Jesus is a physical, we're talking about a physical light too. Physical light. This is the first appearance in Genesis chapter one and verse number three, where the first appearance of the glory of God, the light of Christ in the Bible. I mean, the depth of the Bible. This is why you don't want an NIV.  I mean, how are you gonna figure this stuff out?  I mean, they're gonna wreck all this perfection here. But this is the first appearance of the glory of God in Christ in the Bible. In Genesis chapter, how many verses do we get in the Bible before we see Jesus? Like three. It's like right there. So the point is, is that John chapter one is talking that Jesus is a spiritual and physical light. Now look, and we've all had discussions like this. We've pulled out whiteboards and we've talked about these types of things. But doesn't it make so much sense now that you know this? Why light is such a mystery to us today? I mean, man, they just can't figure out light. No one can. No one can figure out. I think certain things are wrong. I think the theory of relativity is wrong and I think certain people that had ideas on light are just obviously wrong. They've been proven wrong in experiments. But nobody really has their grasp upon what light. I'm talking physical light here is really doing how fast it travels. If it travels faster one way or the other way, if the two way speed is the same. I mean, nobody, if it was the same speed a thousand years ago as it is today, if it's the same speed a million miles away in space as it is right here, nobody really knows. It's almost like it's supernatural or it's got some supernatural aspects to it. Well, the Bible seems to back that up by saying, Jesus is the light. Makes sense. Look at Psalm chapter 84. Psalm chapter 84.  Yeah, like, but we don't have to understand everything about God. That's why God is God and we are who we are. Look at Psalm chapter 84. Psalm chapter 84, look at verse number 11. The Bible says in Psalm chapter 84, verse number 11. The Bible says Psalm chapter 84 and verse number 11. It says, for the glory of God is a sun and a shield. And the Lord will give grace and glory. No good thing will he withhold from them that walk uprightly. We're just talking about how God, again, is that light comparing God to the literal sun. But look, turn to Exodus chapter 34. Let me show you one more neat thing about the physical light of the glory of God or the physical light of Christ. Look at Exodus chapter 34. Go to Exodus chapter 34. Exodus chapter 34 and look at verse. So Exodus chapter 34 is the second time that Moses goes up to get, he goes up to the mount to get the law from God. And of course, he comes down and God says you better get back down there. They're worshiping idols or whatever. And so Moses says to go take care of business down there. But he goes back up and he gets the law from God and he's up in the mount for 40 days and 40 nights with God. Look at Exodus chapter 34 and what is God doing? It's interesting because Exodus chapter 34, look at verse number 28. Let's start with verse number 28. It says he was there with the Lord 40 days and 40 nights. Neither did he eat bread nor drink water. And he wrote upon the tablets, what? The words of the covenant, the 10 commandments. And it came to pass when Moses came down. So what was he doing for 40 days and 40 nights? He was receiving the word from God. He was receiving God's word and he was writing it down on these tablets. Look at verse number 29. It came to pass when Moses came down from Mount Sinai with the two tablets of the testimony in Moses' hand. When he came down from the mount, Moses was not, meaning he didn't know that the skin of his face shone while he talked with him. And when Aaron and all the children of Israel saw Moses, behold, the skin of his face shone and they were afraid to come nigh him. They were afraid to come by him because he was glowing. He was emanating, he absorbed, he absorbed. I mean, we're talking about literal light here. Like his face was literally shining because God was literally speaking the word of God to him which the glory of God was coming off on Moses and it showed you like, how does that physically work? I have no idea. No idea how the glory of the physical light of God could transfer it to someone's body and supernaturally come off and be seen by other people for a certain period of time. But that's exactly what happened. We can't understand it. It is of God, it is God. The glory of God, Jesus gives off actual light. Meaning light is, you know, it's supernatural which makes perfect sense while we can't figure it out completely on this earth. It's not shocking when you look at it from a biblical perspective. So what do we see with these pairs tonight? You see that Jesus is the word and the creator. That's the first pair that goes together. The second pair is that Jesus is the light and the life. Now here's what's interesting, go to John chapter 14. Just like, I mean, you say, how does light go with life? Well, it's another beautiful pairing right here because just as you cannot have eternal life without that spiritual light of Christ, you can't, I mean, that mirrors the physical because you can't have actual life either without physical light. We would die if there was not physical light. Worms the atmosphere, it generates all of our weather. It makes the plants, gives energy to the plants, would give oxygen off that we breathe. I mean, without light, there's no chance for life on this earth. Look at John chapter 14 and verse number six. Now this makes sense. Jesus saith unto him, these two pairs that I just told you about, the word and the creator and the light and the life now make sense. We look at John chapter 14 and verse number six where Jesus says, Jesus saith unto him, I am the way, we'll get to that in a minute. But what does he say he is? He's the truth and the life. You know what that means? He's the word and the light which gives life. He's the truth and the life. And then people always cut off that verse.  It's really irritating. Because the way goes with the last part of the verse. He says I am the way, just as a side note here, no man cometh unto the Father, but by me. Jesus is saying here, I mean that's a divisive statement. People don't like that statement. People don't like the statement that I am the way, the truth and the life. We understand the truth and the life. But no man cometh unto the Father, but by me. The only way you're given to heaven is through Jesus. I don't know what's been going on with me going out souling lately, but I keep running into all these people that are given these answers like how do you know you're going to heaven? Well faith in God, well I have faith. Does God have a name? What is God's name? And it's almost like I'm running into people lately but it's almost like they don't want to say the name Jesus. But I got news for you. You're not going to heaven by faith in some generic God. It's only through Jesus, that's it. Lady told me the other day, like well everybody has their own idea of God and as long as they're, you know, I got there. No, it's only through Jesus. I mean he is the way. He doesn't say a way, Billy Graham. He doesn't say a way. He doesn't say well as long as you feel that, you know, you've found God and you know that's kind of your Jesus. Wrong, it's either through Jesus Christ or you're going to heaven. But you're like what about the guy that fears God? What about the guy that like really fears God but he just doesn't know who Jesus is. This is Cornelius in Acts chapter 10. He just, he really feared God. Well, God sent Peter to him. If he was truly seeking God will send a soul winner to that person.  It is believing on Jesus Christ. The way, the truth, the life. It's the only way. Nobody wants to hear that today. But that's the truth of it. The truth of it. Now here's what's interesting. Turn to Revelation chapter one. A little bit more on this. Turn to Revelation chapter one, look at verse number eight. Revelation chapter one and look at verse number eight. Jesus says in Revelation chapter one and verse number eight. Remember, he was the light at the beginning and he was the light at the end. And it makes a lot of sense now when Jesus says this in Revelation one eight where he says, I am Alpha and Omega. The beginning and ending, sayeth the Lord, which is, which was, which is to come the Almighty. And if you go back to Revelation chapter 22, he said, you know, just talking about the new heaven and the new earth, it says there shall be no night there. There's not going to be night. There's not going to be night there at all. They will, it says they will need no candle. Neither light of the sun for the Lord giveth them light. How? Through the Lamb. So Jesus provided the actual light at the beginning and he provides the actual light at the end. Now go back to John chapter one. Go back to John chapter one. Go back to John chapter one. Do you ever wonder about light and darkness? I mean, why have day and night? Ever think about that? Ever think about why God did that? Why did God do the sun and the moon and light and day? I mean, at the end, when we're all on the new heaven and the new earth and the new Jerusalem is this beautiful city, there is going to be no night. No one will need a candle. We won't need power plants. That kind of makes me sad. But I mean, we're not going to need all these things. All the electricians are like, oh. But we're not going to need this stuff. But why did God have light and darkness? There's no night there at the end. You see, the difference is that now man can choose darkness and light. Man has free will to choose darkness and light. And I'm talking spiritually and physically. Both of these work. Because did you know that physical sin, that actual darkness, sin is more prevalent in actual darkness? What does sin, sin brings, the wages of sin is what? The wages of sin is death. That's that shadow of death. But why is sin more prevalent in the dark? Why are bars dark? Why are casinos dark? Why are clubs dark? Why are all these places that just deal in sin, in fornication, in drunkenness, in wickedness? Why are they all in the dark? Because people don't want to see themselves when they're sinning. People don't want the light shined in situations like that.  You know, that's true. That's true. I mean, even science will tell you this today. Even studies will tell you this today. Let me read you just a little clip from Psytec Daily. It's talking about even your judgment. Psychology, one of the worst sciences out there, literally recognizes that even your judgment is worse when it's dark. From Psytec Daily, the concern that bad things happen after dark now has science behind it. Or just read the Bible. When we are awake during the wee hours, new physiological changes in the brain alter the way we interact with the world, especially actions related to impulse control, reward processing, and high-risk decision-making. If you've ever stayed up late and sent a regrettable tweet, I have never done that. Wolfed down a box of cookies, no comment. Polished off another bottle of wine or gone on the late night QVC shopping spree. You might agree that the mind after midnight is not thinking straight. If you're awake in the middle of the night, it's fair to say that your brain is not functioning at its best. Bad things that happen after dark, the article continues. Homicides and violent crime are more common at night. People are more at risk of engaging in harmful behavior, such as suicide, violent crime, substance abuse at night. Our nighttime food choices at night also tend to be unhealthy as we pursue more carbohydrates, lipids, processed foods, and often consume more calories than we need. A study from PubMed said this. A study found that teens who got nine hours of sleep per night had the lowest levels of mental health issues, including moodiness, feelings of worthlessness, anxiety, and depression. Meaning, if a teen gets nine hours or more of sleep a night, they don't have these problems as much as a teen that doesn't sleep as much.  But when they totally miss the spiritual application here that they say, well, lack of sleep causes depression. No, it's what you're doing when you're not sleeping that's causing depression. It's the substance, you think these scientists would get together and at least talk to each other. You know, it's the substance abuse and the poor choices and all these different wicked things that people are getting into in the dark that's causing the anxiety and the depression and the moodiness and the suicidal thoughts and all these things. It's what they're doing besides sleeping. It's what they're doing what? It's what they're doing in the darkness.  If you don't read the Bible. I mean, just an application for yourself. You're staying up all night. Like, what are you doing that for? If you're up, if you're up to the wee hours of the night, I would ask, what are you doing? Because it's probably not something good is what the Bible is telling us. But the point is back to the point of the sermon we have a choice now. We have a choice of light or darkness. We have a spiritual choice. That's why the Bible says in John chapter one that God gave us the power to become sons of God by what? By believing on his son. By believing on Jesus. We can spiritually choose the light or we can embrace the dark. We can embrace the shadow of death. I mean, this is the depth of the Bible. Let's continue reading here. Look at verse number, look at verse, I don't know where we left off. Let's just finish this out. It says, there was a man sent from God. Now this is gonna make more sense to you. Now that we really dissected this whole thing. There was a man sent from God whose name was John. We're talking about John the Baptist here. The same came for a witness to bear witness of what? Of the light. That all men through him might believe. He was not that light, talking about John the Baptist, but he was sent to bear witness of that light. That was the true light, which lighteth every man that come into the world. He was in the world and the world was made by him. There we see the creator again and the world knew him not, meaning the world didn't accept Jesus as the light. Look at verse number 11. And he came unto his own and his own received him not. The vast majority of the Jews, the mainstream Jews did not receive Jesus. If you didn't get that from the book of Acts, that's who was chasing around Paul the entire time. It wasn't the Romans at that point. Look at verse number 12. But as many as received him, look at this. He gave the power to become the sons of God. Lowercase S to become adopted children into God's family. Even to them that believe on his name. Which were born not of blood, nor of the will of the flesh, nor of the will of the man, but of God. Notice it's not of the will of the flesh, nor of the will of man. Meaning there's nothing that we did with our flesh, our body to get that.  And verse number 14 wraps it all up right here. And the word was made flesh and dwelt among us. And we beheld his glory. The glory as of the only begotten of the father full of grace and there it is, truth. Jesus is the word. We see Jesus here is the word and he's the creator. That matches up with the truth. In John chapter 14 and verse number six. And then that word became flesh and it's that light that gives us life. Physically through the creation and also more importantly that spiritual everlasting life. That's who Jesus is in the first 14 verses of the book of John. Let's bow our heads and have a word of prayer. We'll finish up John next week, John chapter one next week. Dear heavenly father, I thank you for just this beautiful explanation of who Jesus Christ is in the Bible. I thank you for just.


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