strings: One must have the capacity to investigate all these things anew; because it is only through direct experience that our problems are solved, and to have direct experience there must be simplicity, which means there must be sensitivity. A mind is made dull by the weight of knowledge. A mind is made dull by the past, by the future. Only a mind that is capable of adjusting itself to the present, continually, from  moment to moment, can meet the powerful influences and pressures constantly put upon us by our environment.