Prabhupāda: Kṛṣṇa is training you. He says, sarva-dharmān parityajya mām (BG 18.66), but if you don't take His training, then you remain in your own training. Who objects? Remain a rascal. Who objects? You continue to become a rascal. What can be done? That yathecchasi tathā kuru is already said. You use your intelligence. If you prefer to remain rascal, you remain. Kṛṣṇa does not say that, "Don't use your intelligence." What does He say? But if you are actually intelligent, then you will think that "Who can be more intelligent than Kṛṣṇa? Let me take His advice." That is real intelligence. Why shall I use my tiny intelligence? That is real intelligence.
Nandarāṇī: Kṛṣṇa was speaking to Arjuna, and Arjuna had real intelligence, but nowadays if someone tries to consider Kṛṣṇa's instructions and deliberate fully and make some decision, he always makes the wrong decision.
Prabhupāda: No, therefore he has to accept spiritual master to guide him. Just like simply by reading books you do not become educated. You go to school and read before the teacher. Then you'll understand. You cannot become a medical man by purchasing books from the market and reading at home. You must go to the medical college. Tad vijñānārthaṁ sa gurum evābhigacchet (MU 1.2.12). Not only reading, but you go to the person who is actually realized. Tad viddhi praṇipātena paripraśnena sevayā (BG 4.34). Everything is there. You cannot understand individually. That is not possible. If you are extraordinarily intelligent, you can do that. That is exception. But ordinarily it is not possible. Therefore the spiritual master is there. He'll guide you.