Punah punas carvita-carvananam. Chewing the chewed. Just like you chew one sugarcane and throw it on the street. But if somebody comes again to chew it, then he’s a fool. He must know, “The juice has been taken away from that sugarcane. What shall I get by chewing?” But there are animals like that. They want to chew again.

So this material society means chewing the chewed. A father gives education to his son to earning livelihood, gets him married and settles him, but he knows that “This kind of business, earning money and marrying, begetting children, I have done, but I am not satisfied. So why I am engaging my son in this business?” This is called chewing the chewed. Chewing the same thing. “I have not been satisfied with this business, but why I am engaging my son also?” The real father is he who does not allow his son to taste the chewing the chewed. That is real father. Pita na sa syaj janani na sa syat, na mocayed yah samupeta-mrtyum [SB 5.5.18].

This is real contraceptive. A man should not desire to become a father, a woman should not desire to become a mother, unless they are fit to save the children from the impending clutches of death. That is the duty of father and mother.

From Srila Prabhupada’s lecture on Srimad-Bhagavatam 3.25.12 — November 12, 1974, Bombay