Then the various professional duties in household life were inaugurated, and the method of maintaining a livelihood without anyone's cooperation by picking up rejected grains
SB Canto 3
Then the thread ceremony for the twice-born was inaugurated, as were the rules to be followed for at least one year after acceptance of the Vedas, rules for observing complete abstinence from sex life, vocations in terms of Vedic injunctions, various professional duties in household life, and the method of maintaining a livelihood without anyone's cooperation by picking up rejected grains.
During student life the brahmacārīs were given full instructions about the importance of the human form of life. Thus the basic education was designed to encourage the student in becoming free from family encumbrances. Only students unable to accept such a vow in life were allowed to go home and marry a suitable wife. Otherwise, the student would remain a permanent brahmacārī, observing complete abstinence from sex life for his whole life. It all depended on the quality of the student's training. We had the opportunity to meet an avowed brahmacārī in the personality of our spiritual master, Oṁ Viṣṇupāda Śrī Śrīmad Bhaktisiddhānta Gosvāmī Mahārāja. Such a great soul is called a naiṣṭhika-brahmacārī.