There are different phases of knowledge: pratyakṣa, parakṣa, adhokṣaja, aprākṛta. Pratyakṣa, parakṣa, aparakṣa, adhokṣaja, aprākṛta. So not all knowledge are of the same . . . same platform. So pratyakṣa. The material knowledge means pratyakṣa. Means "Direct perception." But there are other knowledges. Parakṣa: to get from the authority. That is still perfect. Still perfect. Therefore direct perception. I cannot see what is there beyond this wall, but if somebody is there beyond that wall, he says: "It is like this," I get perfect knowledge.
So we are so fool that we simply believe in direct perception. No. Direct perception is never perfect, because our senses are imperfect. So how you can get perfect knowledge? At night I cannot see anything, so what is the use of my these eyes? It is conditioned. So anyone who believes in perfect . . . direct perception, his knowledge is imperfect always, because the senses are imperfect. Therefore we have to receive knowledge from the perfect: Kṛṣṇa, the supreme perfect. Uttamam. He is above, above this darkness. He comes from the kingdom of light.