Devotee: The question is, Prabhupāda, that if there is question, or not understanding in the course of a class, if the proper answer cannot be given, if one sincerely approaches you within the heart, then you will give understanding?
Prabhupāda: I have given understanding already in my book. That I am explaining. Why these books are being written? Just to explain things very nicely. They are already there. You try to understand. If you cannot understand, then you . . . (break) . . . has not made the thing clear. But you are unable to understand. So in that case you have to cleanse yourself. Ceto-darpaṇa-mārjanam (CC Antya 20.12, Śikṣāṣṭaka 1). Both things.
You must be able to understand, and the instructor should be able to make you understand, both of them. Just like Śukadeva Gosvāmī and Parīkṣit Mahārāja, Arjuna and Kṛṣṇa. One answer, and he's answered, but the answer is not understandable by us. But Arjuna is understanding. Śukadeva Gosvāmī is understanding. Just like this is a question, attempt.
Bali-mardana: Śukadeva Gosvāmī and Parīkṣit?
Prabhupāda: Yes. So sometimes we cannot understand due to our incapable. But things are already there. So by discussing, by repeated trying to understand and being cleansed of heart, everything will be done. Tad viddhi praṇipātena paripraśnena sevayā (BG 4.34). The two things are there, seva and praṇipāt: surrender, at the same time, some service. Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (Brs. 1.2.234). If one is inclined to give service, then automatically things become understood. This is science like that.