"The same thing, we are preaching. That is Kṛṣṇa consciousness movement. It is nothing new. It is coming down from the original speaker, Kṛṣṇa, by disciplic succession. So we are reading this Bhagavad-gītā. Not that I have manufactured some book and I am preaching. No. I am preaching Bhagavad-gītā. The same Bhagavad-gītā as it was first spoken forty millions of years ago to the sun-god and again it was repeated five thousand years ago to Arjuna. The same thing is coming down by disciplic succession, and the same thing is presented before you. There is no change."
(Srila Prabhupada Lecture, Pittsburgh, September 8, 1972)