"Now the last instruction in the Bhagavad-gītā, as Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja [Bg. 18.66]. He has instructed to Arjuna all kinds of yoga system, all kinds of religious ritualistic process, sacrifice, and philosophical speculation, the constitutional position of this body, constitutional position of the soul. Everything He has described in the Bhagavad-gītā. And at last He says to Arjuna, 'My dear Arjuna, because you are My very intimate and dear friend, therefore I say the most confidential part of Vedic knowledge.' And what is that? 'You simply surrender unto Me.' That's all. People are not inclined to surrender; therefore he has to learn so many things. Just like a child, he has simply a feeling of surrender to the parents, he's happy. There is no need of learning philosophy how to live very happily. The child is completely dependent on the care of parents and he's happy. Simple philosophy. But because we have advanced in civilization, in knowledge, therefore we want to understand this simple philosophy in so many jugglery of words. That's all. So if you want to learn in jugglery of words, then this Kṛṣṇa consciousness movement is not lacking. We have got volumes of books of philosophy. But if you accept this simple process, that we have to... God is great and we are part and parcel; therefore my duty is to serve and surrender unto God. That's all. So Caitanya Mahāprabhu, without discussing all the constitutional position, philosophy, knowledge, and so many other things, yoga system, He immediately begins that the constitutional position of the living entity is to serve the supreme whole. That is... That is the beginning of Caitanya Mahāprabhu's teaching. That means where the teachings of Bhagavad-gītā ended, Caitanya Mahāprabhu begins from that position."
(Srila Prabhupada Lecture, Seattle, October 2, 1968)