So we have to accept these things that we are prone to commit mistake, we are illusioned, we cheat, and our senses are imperfect. Then how I can give you perfect knowledge? That is not possible. But if you accept the Vedic knowledge... Just like I gave you the example: Vedic knowledge says sometimes contradictory. Just like cow dung, stool of an animal, is pure. And if you analyze, you will find it is pure. So our process of acquiring knowledge is from the Vedas. Vedaiś ca sarvair aham eva vedyam (BG 15.15). And what is the purpose of the Vedas? Why Vedic knowledge is perfect? Because it is spoken by God. God is perfect, and whatever He speaks, that is perfect. Therefore God is called "God is good." All-good. Whatever He does, whatever He speaks, everything is good, perfect.
So we are receiving knowledge of this transmigration of the soul from God, Kṛṣṇa. Therefore, it is perfect. He says, dhīras tatra na muhyati. After the death of a person, one should not be bewildered. He should be dhīra, he should be sober to know how things are happening. That is called knowledge. How, after the passing of the soul from this body, how the soul accepts another body? That also you learn from the Supreme Personality of Godhead, Kṛṣṇa. We can see with our material eyes this gross body, the gross covering made of earth, water, fire, air, ether. But there is another covering. What is that? Mind, intelligence, and ego. So you cannot see mind, you cannot see intelligence, neither you can see ego, and what to speak about the soul? The soul is still finer. The dimension of the soul is mentioned in the Vedas: keśāgra-śata-bhāgasya śatadhā kalpitasya ca (CC Madhya 19.140). Just the tip of your hair you divide into one hundred parts, and again take that one-hundredth part and divide again into another hundred parts, that means one ten-thousandth part of the tip of hair is the length and breadth of the soul. So how you can see? You can simply perceive that there is soul, and it is confirmed by the authority of Vedas. And how the soul passing from one body to another, that also you can hear how it is passing. The example is given, just like this some good smell, flavor, is passing by the air and you smell, you feel, "Oh, very nice smell." But you cannot see the smell, neither the carrier of the smell. The carrier of the smell is the air, and the smell, it is still finer. But when it comes before your nose, the instrument, you understand that there is very nice flavor passing. You can experience, although you cannot see, you cannot touch, you cannot taste. So it is not that, that sometimes things which are beyond the test of our material senses, they are not existing. That is foolishness. We must accept that our senses are imperfect. So how we can understand everything by the test of experimental knowledge? No.
Therefore, things which are beyond your perception, you have to accept it by hearing from the authoritative source. Just like another example: If you want to see who is your actual father, that is not possible to make an experiment who is your father. There may be some experimental. But if you ask your mother, authority, "Mother, who is my father?" the mother says, "This is the man who is your father," you have to accept, that's all. You cannot make any experiment, neither it is possible to understand who is your father by experimental knowledge. Then how you can make experiment the Supreme Father, God? That is not possible. Simply you have to hear from the authoritative sources. But you can make some experiment. But that is not very important thing. The important thing is to hear from the authorized person. That is important. Therefore, Vedas are called śruti. Śruti means aural reception. You have to hear. Just like when you are sleeping, all your other senses are not active. But ear, if somebody is coming, your enemy, to hurt you, and your friend says, "Mr. such-and-such, wake up, wake up," so you can hear and you wake up and see that somebody is coming. So the ear is very important. Śrotriyaṁ brahma-niṣṭham (MU 1.2.12). Anyone who has heard perfectly from the disciplic succession of spiritual master, he is perfect. Ācāryavān puruṣo veda. Ācārya means... Ācāryavān, vān means possession. One who has possessed an authorized spiritual master, he knows. He knows. Veda, Veda means knowledge, knows.