Because people are producing children against religious principle, therefore the whole world if full of varṇa-saṅkara, and there is no peace. So if you follow the principles of Bhagavad-gītā, automatically there will be peace. Because every children, every boy, every girl will be sober, Kṛṣṇa conscious. And therefore śāstra prohibits, pitā na sa syāt (SB 5.5.18), one should not become father; jananī na sā syāt, one should not become mother—gurur na sa syāt, one should not become guru. One . . . in this way, there are . . . why? Na mocayed yaḥ samupeta-mṛtyum. If you cannot stop the course of birth and death of your children, then don't become a father. This is called religious contraceptive. Remain without children. That is called dhārmika life. If you can stop the birth and death of your children . . . birth and death means . . . because dehino 'smin yathā dehe kaumāraṁ yauvanaṁ jarā (BG 2.13). The real soul, the real life is within the body, and he's transmigrating. The transmigrating from one body to another, that is called death. And when he comes out from one, another body, that is called birth. So as soon as you get—kleśada āsa dehaḥ—this body, full of miserable condition, then you again put into miserable condition of life. Therefore if you can stop your children's birth and death any more, then beget children. This is the śāstric injunction. And if the father does not know how to stop his own birth and death, then what is the use of producing children? The father should be so sympathetic with the children, with the sons, that he must know what is the pains and pleasure of birth and death.
So every parent desires welfare of his children, of their children. So this is the greatest welfare, that, "This child has come in my womb, he has become my son. This is the last time. No more birth and death. He will be educated in that way." That is father's responsibility.