I have already explained that our process of accepting knowledge is the paramparā system. Avaroha-panthā. There are two ways of acquiring knowledge: āroha-panthā and avaroha-panthā. Knowledge coming from the authorities, that is perfect knowledge, and knowledge acquired by experimental knowledge, that is not perfect. Because we are imperfect.
Suppose a big professor, just like that Russian Professor Kotovsky, they are trying to understand things by so-called inductive process, or āroha-panthā, going up by one's speculation, by speculative method. But our process of knowledge, Vedic process of knowledge: tad-vijñānārthaṁ sa gurum eva abhigacchet (MU 1.2.12). Their knowledge should be taken from the authority. Do not manufacture knowledge.
Because how you can manufacture perfect knowledge? You are imperfect. Your senses are imperfect. You are defective in four ways. You are . . . "To err is human." You must commit mistake; you must be illusioned; your senses are imperfect; and you have got a cheating propensity. These four defects are there. Those who are not liberated, mukta-puruṣa, they have got four defects.
What is that? He must commit mistake. Just like we can give you instance: Our Mahatma Gandhi, he was so great personality, but he also committed so many mistakes. Even on the day of his death, it is heard that he was forbidden not to go the meeting. The other persons, they scented some danger. But he forcibly went there and he was killed.
So mistake, committing mistake. To err is human. That is not fault, that is our habit. We commit mistake. And we also, we are illusioned. Illusioned. Just like I am not this body, I am spirit soul, ahaṁ brahmāsmi. But we are giving identification with this body, "I am Indian," "I am American," "I am brāhmin," "I am śūdra." So this is illusion. So to commit mistake and to become illusioned and cheating propensity: "Actually, I do not know things as they are, still, I am writing books, to educate people."