Don't say "no." But give a taste for the good, then it will be automatically "no." And if you say "no," then they will rebel. The four "no's," that is very difficult. Still they are breaking. No illicit sex, they are breaking. But if they develop Krsna consciousness, this will be automatically "no." So don't bring many "no's," but give them positive life. Then it will be automatically "no." And if you say "no," that will be a struggle. This is the psychology. Positive engagement is devotional service. So if they are attracted by devotional service, other things will be automatically "no." Param drstva nivartate [Bg. 2.59]. Just like Ekadasi day, we observe fasting. And there are many patients in the hospital, they are also fasting, but there is no "No." They'll, within heart, "If I get, I shall eat, I shall eat." But those who are devotee, they voluntarily "no." The same fasting is going on for the devotees and the hospital patient. And that "no" and this "no," there is difference.

(Srila Prabhupada — July 31, 1976, New Mayapur)