760701b - Conversation - Srila Prabhupada Speaks a Nectar Drop in New Vrindaban

Nectar Drops from Srila Prabhupada
"To advance in spiritual life these things are essential, tapasya. Tapasya means voluntarily accepting something which may be painful. Just like we are recommending no illicit sex, no gambling, no meat-eating. So those who are accustomed to these bad habits, for them, in the beginning it may be a little difficult. But in spite of becoming difficult, one has to do it. That is called tapasya. To rise early in the morning, those who are not practiced, it is a little painful, but one has to do it. So this is called tapasya. So according to the Vedic injunction, there are some tapasyas that must be done. It is not, "I may do it or not do it." It must be done. Just like in the Muṇḍaka Upaniṣad it is ordered that one must go to the spiritual master. Tad-vijñānārthaṁ sa gurum evābhigacchet (MU 1.2.12). So there is no question of voluntarily, but it must be. And one must carry out by the order of a spiritual master and the order of the śāstra. That is called tapasya."
760701 - Conversation B - New Vrindaban, USA