Bhagavad-gītā is there, the four divisions of human society, brāhmaṇa, kṣatriya, vaiśya, śūdra. So each one's duty is prescribed. Brāhmaṇa's duty, kṣatriya's duty, vaiśya's duty, śūdra's duty, brahmacārī's duty, everything is there.
Guest (3): Whether a man should be a shopkeeper or a teacher or a carpenter, the Bible won't tell me that, and the Bhagavad-gītā won't tell me that.
Prabhupāda: Bhagavad-gītā is there, the four divisions of human society, brāhmaṇa, kṣatriya, vaiśya, śūdra. So each one's duty is prescribed. Brāhmaṇa's duty, kṣatriya's duty, vaiśya's duty, śūdra's duty, brahmacārī's duty, everything is there.
Guest (3): But then you said before that if I think I'm brahmacārī, then I should be a brahmacārī. If I become a śūdra, I act as a śūdra.
Prabhupāda: Yes, you act as a brahmacārī, do your brahmacārī work, you'll be successful.
Guest (3): But how do I know that I am thinking properly?
Prabhupāda: Therefore I say it is mentioned in the śāstra, brahmacārī guru-kule vasan dānto guror hitam (SB 7.12.1). If you want to be a lawyer, you must know the law. Without knowing the law, how you become a lawyer? Without knowing the engineering art, how you become engineer? So either you become a brahmacārī, gṛhastha or vānaprastha, sannyāsī, or anything, you must know what you are meant for. Without knowing, how you can become brahmacārī?
Guest (3): I must know what I am meant for.
Prabhupāda: Yes.
Guest (3): But that's what my question is, how does one know.
Prabhupāda: Then you have to go to the... Tad-vijñānārthaṁ sa gurum evābhigacchet (MU 1.2.12). Just like we were discussing Sanātana Gosvāmī, he has gone to Caitanya Mahāprabhu, he said, "Sir, You have brought me from the entanglement of family life. Now tell me what is my duty." So that discussion is going on. So you should approach guru and take instruction from him what is, how to act. If you want to act as a brahmacārī, he'll give you direction, "You do this." If you want to act as a gṛhastha, he'll give you direction, "You do like this." That is wanted. The guru, the parents, the government, they should guide.