Ksetra means field of activities. Just like in agricultural land. You get a piece of land, and you produce your own food grain, or as you like. The government gives you a piece of land, and you have to pay a little tax, and you can grow your food grains as you like. Similarly, as we wanted, Krsna has given us this body. Now we can work with this body as we like. If you want, you can utilize this body for higher elevation, or you can utilize this body for your nonsense purpose and go to hell. That is your choice. Just like somebody is using this body, undergoing austerities, penance, according to the spiritual, regulative life, and one man is using this body only for sense gratification, drinking and sex.
Lecture on Bhagavad-Gita 13.35, Geneva, June 6, 1974