The basic flaw in modern civilization is that boys and girls are given freedom during school and college to enjoy sex life

Expressions researched:
"The basic flaw in modern civilization is that boys and girls are given freedom during school and college to enjoy sex life"

SB Canto 4

Unless one practices penances and austerities in his student life, he cannot understand the existence of God.

SB 4.31.1, Purport:

In the beginning of life, as a brahmacārī, one has to undergo severe penances and austerities in order to be educated in spiritual values. The brahmacārī, or student, is never allowed to mingle with women and learn from the beginning of life about sex enjoyment. The basic flaw in modern civilization is that boys and girls are given freedom during school and college to enjoy sex life. Most of the children are varṇa-saṅkara, meaning "born of undesirable fathers and mothers." Consequently, the whole world is in chaos. Actually, human civilization should be based on the Vedic principles. This means that in the beginning of life boys and girls should undergo penances and austerities. When they are grown, they should get married, live for some time at home and beget children. When the children are grown up, the man should leave home and search for Kṛṣṇa consciousness. In this way one can make one's life perfect by going home to the kingdom of God.

Unless one practices penances and austerities in his student life, he cannot understand the existence of God. Without realizing Kṛṣṇa, one cannot make his life perfect.