We are transmigrating from one body to another, exactly like in our present life. Just like all of us present here, we had a body, a small baby body. Where is that body? That body is gone. So far I am an old man. I remember that I was a small baby. I still remember when I was about six months old I was lying down on the lap of my eldest sister, and she was knitting, and I was lying down and playing. I remember. So it is possible for everyone to remember that "I had a small body, then that I had a boy's body, then I had a youthful body. Now I am in this body." So where are those bodies? The body's now gone. It is a different body. That is explained in the Bhagavad-gītā, tathā dehāntara-prāptiḥ (BG 2.13). Similarly, when I give up this body, then I'll have to accept another body.
It is very simple to understand. As I have changed so many bodies, not only childhood, babyhood, boyhood, youthhood. According to medical science we are changing body every second imperceptibly. So this process, that the soul is permanent... Just like I remember my babyhood body or childhood body. I am the same person, soul, but I have changed so many bodies. Similarly, when ultimately I shall change this body, I shall have to accept another body. This simple formula is stated in the Bhagavad-gītā. Everyone can think on it. And there must be some scientific research. Recently I got one letter from a doctor in Toronto. He suggested there is body..., there is soul. I had some correspondence with him. Actually this is a fact. The soul is there. There are so many proofs. Not only in the Vedic literature, but even ordinary experience. The soul is there, and the soul is transmigrating from one body to another. This is going on, but unfortunately there is no serious study on the subject matter or department of knowledge in the universities. This is not very good.