The biologist, in his study of the behavior of an individual cell, often forgets that it is governed by the over-all life of the whole organism. It is the life and activity of the total organism that motivate the life and activity of the single cell. Man is part of a whole.
Cosmic consciousness expresses itself in cosmic life.
Man himself is a cell in the body of God. When personal and selfish desires pull him in a direction away from that of the divine will, he experiences pain. If he lives in tune with the divine will, he is free from pain and he enjoys a sense of fulfillment, since he consciously desires the divine will and is thus saved from frustration which would be inevitable if he desired the contrary. Desirelessness or indifference to the result of action should not make us callous. Only if you did your best, and did your duty well, and then remained unconcerned about the result, have you understood the spirit of the Gita .