A child, he knows that his body will be changed. Nobody will remain a baby. Nobody will remain a child. Nobody will remain a boy. Next life is awaiting. It is very simple philosophy. And then after this body, another body is waiting. That's a fact. And not only fact. If you cannot understand it—there is no difficulty in understanding—but the authority says, Kṛṣṇa says, tathā dehāntara-prāptiḥ (BG 2.13). As we are changing from this body to that body, this body to that body, this body to that body, every moment . . . according to medical science, every moment we are changing body. That's a fact. But the changing is going so swiftly that we do not see how it is being changed. But if you come after some years . . . just like we are seeing so many children, and if you come some years after, his father says, "This is the same child," oh, you will be sur . . . "Oh!" Because he has changed body. You will say, "Oh, you have become so big."
So it is a fact that we are changing body, and Kṛṣṇa says this example, that as we are changing even in this life the body, similarly we shall have to change this body. The authority says, and we are practical example is there. Why we should not believe in the next life? Even a child can understand. But they are trying to avoid next life. That is their philosophy. If there are next life, and next life one is going to put into the hell and suffering is there, to dismiss this problem they do not believe in next life. This is the real fact. But actually this is the fact. If you live irresponsibly, then you have to suffer. So not that all living entities are going to the hell, but some of them. Some of them. Because most of the living entities, they are less than the human being—8,400,000. So 8,000,000's they are below the human standard of life, human being. They are animals.