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Rāja-vidyā: The King of Knowledge
parataraṁ nānyat kiñcid asti dhanañjaya).  Not only does Kṛṣṇa proclaim Himself to be the highest authority, but this is also accepted by great sages and scholars of  Bhagavad-gītā . If we do not accept Kṛṣṇa as authority and take His words as they are, we cannot derive any benefit from  Bhagavad-gītā . It is not dogmatic; it is a fact. If we study scrutinizingly what Kṛṣṇa says, we will find that it is right. Even scholars like Śaṅkarācārya, who have different opinions from the Personality of Godhead, admit that Kṛṣṇa is  svayaṁ bhagavān —Kṛṣṇa is the Supreme Lord.
Vedic knowledge is not a recent discovery. It is all old revealed knowledge. Kṛṣṇa refers to it as  purā-tanaḥ , which means ancient. Kṛṣṇa says that millions of years before He spoke this  yoga  to the sun god, and we do not know how many millions of years before that He spoke it to someone else. This knowledge is always being repeated, just as summer, autumn, winter and spring are repeated every year. Our fund of knowledge is very poor; we do not even know the history of this planet more than 5,000 years back, but the Vedic literatures give us histories extending millions of years ago. Just because we have no knowledge of what happened 3,000 years ago on this planet, we cannot conclude that there was no history then. Of course one can disclaim the historical validity of Kṛṣṇa. One may say that Kṛṣṇa, according to  Mahābhārata , lived 5,000 years ago, and this being the case, there is no possibility of His having spoken  Bhagavad-gītā  to the sun god so many millions of years before. If I said that I gave a speech on the sun