You will find even an ant, he has got all the propensities, just like human being. You can study how they are struggling, how they have organized their society, how they are eating, how they are sleeping, how they are begetting children. Everything is there in every life. The four principles of bodily demands, namely eating, sleeping, sex and defense, you will find in the insect, smallest insect, like full stop. I sometimes see at night. They wander on the page of the book, very small. But they have got all the propensities. All the propensities. You can study. Anyone, minute study, you can see. So these things are there everywhere, even to the ant or even to the elephant or to the demigod or any Brahmā or in everything. That's all. That is clear.
So when we get by evolutionary process, come to this human form of life by God's grace, nature's mercy, we can understand what is what. Therefore Kṛṣṇa is explaining to Arjuna, a human being, not to a cat and dog. Therefore He says, tat kṣetram, "that body," how it has become varieties, what is the ingredients. The ingredients are the same. This material body, the ingredients are the four primary gross elements, means earth, water, air, fire and ether or sky, the mind, intelligence and ego. This is the composition of this body. And beyond this composition, I am there, soul. Indriyāṇi parāṇy āhuḥ. Those who are in the bodily concept of life, they are thinking, "The senses are everything. So let us enjoy the senses. That is our happiness." No, that is not. Therefore we are not happy actually. Although we are trying to gratify our senses profusely, still we are unhappy, because that is not actually happiness. The actual happiness is of the soul. Unless you satisfy the soul, you cannot be happy, because my real identity is the soul, not this body.
The same example, as I have already said many times, that within the cage there is the bird. You don't take care of the bird, and you simply cleanse this cage—the bird will not be satisfied. He will cry always, "Give me food. Give me food." The another example I gave the another psychiatrist, that this body is a machine—actually it is a machine—and it is being driven by two persons. One is God and one is the living entity, individual. The God is giving direction. The living entity, individual soul, wants to enjoy, so he is on the carriage, same carriage, the Supersoul and the soul. So the Supersoul knows what I want to enjoy, and He is giving facility: "Oh, you want this facility? Now drive your car in this way. You want this facility? All right, drive this way, this way." Actually Supersoul, or God, does not want, but He is so kind. Just like a gentleman, he gives the dog all facility, sometimes going this side, sometimes going this side, sometimes passing stool, sometimes passing urine, and he is standing. He is controlling, but he is giving some facilities: "This dog is my servant. Let him have." This is going on. Without God's sanction, we cannot do anything.