Dehinaḥ, of the living soul, the body is changing. Similarly, after death, after so-called death . . . because there is no death. After stoppage of the function of this gross body, the soul is transferred to another gross body. This statement we get from Bhagavad-gītā. And if we accept this statement, "This is fact," then our spiritual life immediately begins. Without this understanding, there is no question of spiritual understanding—everything vague, simply mental speculation, "maybe," "perhaps." These theories are being forwarded by so-called scientists and philosopher. But we don't accept such things as "perhaps," "maybe." No. We accept what is fact. It is not the question of belief; it is the question of fact. So this is the fact.
Now, how the soul is transmigrating? Suppose after this life I get better life, that's nice. But if I get lower life, then what is the condition? Suppose next life I get the life of a cat or dog or cow. Suppose you get again birth in America. But if you change your body, then whole circumstances change. As human being, you are giving all protection by the state, but as soon as you become another body, either tree or animals, the treatment is different. Animal is going to the slaughterhouse, trees are being cut out. There is no protest.