"He has got little practice of these nonsense things. But if he sticks to Krishna consciousness, this will be stopped very soon. That is the only remedy. So a devotee means he has taken vow before the spiritual master, before the fire, before… If he sticks to his principle, then he's free, even though some bad habits are found due to his past behavior. That will be stopped. But he must stick. Bhajate mam ananya-bhak. That he must stick.
Krishna consciousness must continue. Everything will be corrected. And if there is slackness in Krishna consciousness, then again he'll fall down. That I was telling this morning, that if you have determination, maya will put forward so many impediments, and with all sufferings, if he remains determined in Krishna consciousness, then life is success.
A man is habituated to smoke. He has given up, has promised no more smoking, just like our students. Now he's put amongst some friends, they are smoking. But he has bad habit, he's thinking, 'Why not smoke?' And if the friends offer, 'It is friends. Who is going to see, your spiritual master?' 'Yes.' That is possible.
But if he comes to his sense again, 'Oh, what I have done?' If he repents, 'I promised it before my spiritual master, before God, before fire. Now I'm doing this?' that repentance will help him. And if he thinks that 'I'm doing it. My spiritual master is not here, let me fall to it,' then he is finished. Then he is finished. If he repents for the wrong he has done, then he's excused. Otherwise finished.'"
——(Srila Prabhupada Evening Darsana, Tehran, August 11, 1976)