So if you want real knowledge, then you have to take shelter of these Vedas, Vedic literature, just like Īśopaniṣad. There are 108 Upaniṣads, out of which nine are very important. Out of that nine, this Īśopaniṣad stands first; then Taittirīya Upaniṣad, Māṇḍūkya Upaniṣad, Muṇḍaka Upaniṣad. So the Upaniṣad . . . upa, upa means nearing. So this knowledge will take you nearer to Kṛṣṇa.
And amongst the learned society, ācāryas, the śruti-pramāṇa . . . evidence is śruti. Śruti means these Vedas. They are not experimental knowledge. They are not knowledge established by the research work of contaminated, conditioned soul. Contaminated, conditioned soul, their senses are imperfect. They cannot see things as they are. Simply they theorize: "It may be like that." So much they can say. So "It may be like that," that is not knowledge. Knowledge, definite. There is no mistake.
Conditioned souls, they commit mistake, they are illusioned, they cheat . . . cheating means one who does not understand what is Bhagavad-gītā but he is writing commentary on Bhagavad-gītā. This is cheating, cheating the public.