We want to keep body very fit, healthy and beautiful, very nicely kept. Why? Why we take care of our body? Because I, the spirit soul, part and parcel of Krsna, I am living in this body. Therefore I take care of my body. Nobody takes care of the dead body. This is a fact. Either I take care of my body, or my family's body, or my wife's body, or my children's body.
Why? Because the part and parcel of Krsna is there. The soul is there.
Lecture on Bhagavad-gita 4.11, Bombay, March 31, 1974