Mahā-muni, he is liberated. He is incarnation of God. He knows past, present, future and everything. That knowledge is perfect. One who knows past, present and future perfectly, we should take knowledge from him. That is our Kṛṣṇa consciousness movement, that we don't accept any knowledge from a person who is defective in so many ways. And what is the value of such knowledge?
He is defective. "Physician heal thyself." A physician suffering from fever, and if I go there, "Sir, I am also feverish. Treat," what is the use of such treatment? His brain is already puzzled. What he can treat? The doctors also, when he become sick, he does not treat himself. He calls another doctor friend to treat him. That is the fashion.
So similarly, one who is imperfect, one who is subjected to so many defects of life, we cannot accept knowledge from them. This is our Kṛṣṇa consciousness movement. We don't accept. We accept knowledge from the Vedas, which is perfect. As I have several times explained, that Veda says that stool of animal is impure.
Again, Veda says that the stool of cow is pure. Now, you will say, "Oh, this is contradictory. Sometimes it is said pure, and sometimes . . . this cow is also animal. First of all you said that the stool of any animal is impure, and again you say the cow dung, the stool of another animal, is pure." It is fact—it is pure.