18.19 Jnanam etc.  In enumerating the Strands :  In the consdered conclusion of the Sankhya  where the Strands are decided numerically, these instruments of  knowledge etc., are declared to be of three types.  that you must listen to.  This is what is  conveyed by the association of words  (or ideas)  here.  By instrument-of-knowledge  (Jnanam)  the two-fold instruments viz. that of knowledge and of activity, are spoken of.  Similarly object (karman)  speaks of both the object of knowledge and  the object of activity and agent  (kartr) refers to both the knower and the performer.								
 Now the three verses.  Sarvabhutesu etc.  (20-22) speak of the three-foldness of the instrument of knowledge.  That is why the Instrumental Yena is employed.  The nature of all the instruments of knowledge and of action is described by this much of portion.  The three-foldness of object of both the types viz.  the object of knowledge and the object of action is described by the tripple verses Niyatam etc.  (23-25).  The three-fold nature of the agent of both the categories viz.  the knower and the doer is briefly explained by the three verses  Muktasangah etc.  (26-28).  The three types of the intellect is examined by three verses,  Pravrttim etc.  (30-32), in order to explain the different nature of   the two-fold   instruments  (i.e. of knowledge and of action). By this means the three-fold nature of other instrumetns is also indicated.  The instrument reires technical  know-how, and this technical know-how, of course, consists of the pentad that includes content and so on.  However, because faith [included in this pentad]  has already been dealt with  (XVII, 2ff.), and because the desire to know and the aversion to know [both belonging to the pentad] are obtained by inference through the firmness and happiness [of the pentad],  the three-fold division of the last two is explained by the verses  Dhrtya yaya etc. (33-35) and Sukham tu idanim etc.  (36-39).  All this [the Lord] declares [one by one] ;-