In the human society, it is a prerogative to know God. In the animal society, there is no such question. The human society is meant for understanding what is God. That is the privilege of human being. We come to this form of human being after many, many births. There are 8,400,000 species of life, beginning from water. Then on the land . . . in the water there are nine lakhs species of life, different aquatics. So in the beginning of creation the whole planet was merged into water. That is also scientifically . . . modern science. And from śāstras also, we understand, pralaya-payodhi-jale dhṛtavān asi vedam, keśava dhṛta-mīna-śarīra jaya jagadīśa hare. So in the beginning there was water. So there must be living entities, because living entities are everywhere—in the water, in the air, on the land, within the land, within the water, everywhere. Therefore the living entities are called sarva-ga. Sarva-ga means the living entity can go anywhere. As we are now trying to go to the moon planet, so we may go or not go, but there are living entities in all the planets, in different positions. There are innumerable planets and innumerable universes also. And beyond this material world, there is another nature. Paras tasmāt tu bhāvaḥ anyaḥ avyaktaḥ avyaktāt sanātanaḥ (BG 8.20). That nature is permanent.
This material nature is not permanent. It is bhūtvā bhūtvā pralīyate (BG 8.19). Everything here, in the material world, everything comes into existence, takes birth, janma, then stays for sometimes, grows the body, then produces some by-products, then dwindles and then finished. This is the material nature. Just like your body, my body, it has taken birth at a certain date, it is growing, and it is producing some children, by-products. Then, as we are growing old, then one day the body will be finished. This is the material nature. Either you take it personally, individually, your body, or this gigantic body of the universe, in whichever way you may take it, the nature is bhūtvā bhūtvā pralīyate (BG 8.19). Here the material nature is you take your birth or appearance and again disappear and again appear. This is the instruction of spiritual life. The spirit soul is there, but it is not getting a permanent settlement. This is material world. Tathā dehāntara-prāptiḥ (BG 2.13). As the body is changing, there are so many children, they will also become old like me. But the spirit soul is there. In the presence of mother, although the body is changing, the mother knows that, "My son is there." Although from babyhood the son has grown to boyhood, the body, original body, child's body, baby's body, is not existing, the mother knows that "My boy is there."
So this is common-sense understanding. People do not understand it, very nice common sense, that the body is changing but the soul is there. Exactly the same example: the mother knows that, "My boy, my child, although he has changed body, now he is grown-up, say, fifty years old, but my child he is. He is my child." Where is the difficulty to understand? Anyone can understand. But people do not believe in the transmigration of the soul. Yasyātma-buddhiḥ kuṇape tri-dhātuke (SB 10.84.13). This kind of education, what is the value? The real knowledge begins when we understand that we are not this body, material body; I am different from body.