"A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism"

In this quote, Carl Sagan is suggesting that having a celibate clergy, or religious leaders who have taken a vow of celibacy, is a useful principle. He believes that this practice can assist prevent the giving of severe beliefs or behaviors from one generation to the next. By avoiding sexual relationships, the clergy may be less likely to have children who acquire their strong religious convictions and possibly end up being enthusiasts. Sagan suggests that celibacy can assist promote a more moderate and balanced technique to religious beliefs, lowering the danger of fanaticism. In general, he sees celibacy as a method to promote a much healthier and more rational spiritual community.