Ask any student who are practicing yoga, so-called meditation, they are inclined to this body. They are trying to exercise this body and they think that this is the final. No. Simple truth, very simple truth. Krsna, as the supreme authority, presenting very simply, that dehino 'smin yatha dehe kaumaram yauvanam jara [Bg. 2.13]. As in this body there are different changes, similarly the ultimate change is called death. But the spirit soul, as he's existing within this body in spite of all changes, similarly the spirit soul will continue to exist even after the final change of this body. This simple truth. Try to understand this. This is the basic principle of further progress. If one does not understand this point of view, there is no progress. This is ABCD, that "I am not this body."
Lecture on Bhagavad-gita 2.13-17, Los Angeles, 29 November, 1968