Tapasya means voluntarily accepting some rules and regulations to purify him. That is called tapasya. Just like in diseased condition, one has to voluntarily accept the rules and regulations enforced by the physician: "You should not eat this. You should not do this. You should not go out. You should take rest. You should not, should not, should not," so many. Similarly, if we want to purify ourselves, then four principles of purificatory process, namely illicit sex life and intoxication, meat-eating, and gambling, these four things must be...
These four things are paraphernalia of your civilization. In the western... Not only western, eastern, everywhere. The Kali-yuga is spreading very rapidly, and wherever the Kali-yuga is very prominent, these four items are very prominent: unrestricted sex life, gambling, and meat-eating, and intoxication.