Srila Prabhupada: Yes, you must. Because you have surrendered to your spiritual master, his order is final. So even if you don't like it, you have to do it. To please me.
Srila Prabhupada: But you don't like... [He laughs.] Nobody likes to fast, but the spiritual master says, "Today, fasting," so what can be done? [Syamasundara laughs.] A disciple is one who has voluntarily agreed to be disciplined by the spiritual master. That is austerity.
Syamasundara: Say, like our parents or many people in the material world, completely enamored by the material life -- they don't want to undergo austerity or bodily pain, but still they must. They are being forced by nature to suffer austerities.
Srila Prabhupada: That is forced austerity. That is not good. Voluntary austerity will help.
Syamasundara: If you don't undergo voluntary austerity, then you must be forced to undergo austerity.
Srila Prabhupada: That is the difference between man and animal. An animal cannot accept austerity. But a man can accept it. There is a nice foodstuff in the confectioner's shop, so a man wants to eat it, but he sees that he has no money, so he can restrain himself. But when a cow comes, immediately she pushes her mouth in. You can beat her with a stick, but she will tolerate it. She will do that. Therefore an animal cannot undergo austerity. Our austerity is very nice. We chant Hare Krsna, dance, and Krsna sends very nice foodstuffs, and we eat. That's all. Why are your people not agreeable to such austerity? Chanting, dancing and eating nicely?
Bob: What is that?
Srila Prabhupada: Because we are following austerities, Krsna sends us nice things. So we are not losers. When you become Krsna-ized, then you get more comforts than at the present moment. That's a fact. I have been living alone for the last twenty years, but I have no difficulties. Before taking sannyasa I was living in Delhi. So I had no difficulties, although I was living alone.
Perfect Questions, Perfect Answers Chapter 6: The Perfect Devotee