Kṣetra means field. Just like a tiller, agriculturist, he is given a certain tract of land, and he tills and produces grains or some vegetables or something eatable. And according to his capacity, there is production, and he makes profit out of it. Similarly, this body is the field, and I am, or you are, who is occupying this body, we are tillers. This body is given by nature, and I am spirit soul. As I want . . . just like one may possess a very valuable land, one may possess not so valuable, ordinary, and one may possess a third-class field, similarly, we living entities, we are given a certain type of body to work with it and enjoy or suffer the resultant action.
We are part and parcel of God. As we are living beings, similarly Kṛṣṇa, or God, is also living being. But He is Supreme; we are subordinate. God is great, and we are under Him. Just like in a family the father is the chief man, and the next important is my mother, and we all children, they are all subordinate to the father and mother. The father earns. The mother distributes. We eat. We live.
Just try to understand in this way. God is the supreme father, and this material nature is the mother. The father . . . as this father injects the seed of living being within the womb of the mother, similarly, God injects the living being within this material world, and they come out under different forms with the material body. That varieties of material bodies are 8,400,000's of species. As we get according . . . yathā yoni yathā bījam. As we are getting life here according to the father's semina and mother's secretion, the body and situation . . . somebody is very highly intelligent; somebody is not so intelligent. Somebody is very rich, somebody is poor. Somebody is middle class. Somebody is animal. Somebody is tree. Somebody is insect. Somebody is aquatic. Varieties of life.