(Prabhupada's lecture - Śrīmad-Bhāgavatam 2.1.1 - Delhi, November 4, 1973)
As we are changing our body in this life from childhood to boyhood, boyhood to youthhood, then old man, then we give up this body, Kṛṣṇa says that similarly, as I was a child, now I have got a different body, similarly, when I give up this body, I'll get another body. Tathā dehāntara-prāptiḥ.
The people do not even know that there is dehāntara-prāptiḥ, again we have to accept another body. They do not care for it. And there are so many varieties of body. Just like if we are sitting here, so many ladies and gentlemen, each one of us has got a different type of body. Nobody's body is similar exactly to the other body. This is a fact. We can see. So why we have got different types of body? That we do not try to understand. Not only human body, but there are other bodies also. Jalajā nava-lakṣāṇi sthāvarā lakṣa-viṁśati. We have got bodies in the water, we have got bodies on the land, the tree life, the plant life, the insect life, the birds' life, the beast life, the human form of life... Amongst the human beings there are different varieties—some American, some Indians, some others. So why they are different bodies? What is that science? Why there are different types of bodies?
The different type of body is due to our different karma and different mentality. That we do not know. But Parīkṣit Mahārāja, although he is king... Nowadays the king and president, they are sure that "I am Prime Minister" and "I am President. My position is secure," because he is prime minister. This is the difficulty. The big, big men, they think that "My position is secure," "I am prime minister," "I am Rahis," "I am Birla," "I am big man, so my position is secure." But Parīkṣit Mahārāja did not think like that. Although he was the emperor, most powerful king, Parīkṣit Mahārāja, he did not think that "I am secure. Because I am emperor of the world, I am secure." No. He immediately become alert: "Oh, I will have to die within seven days. So I must prepare." This is the problem. We do not know whether we are going to die within seven seconds, because there is no guarantee, whereas Parīkṣit Mahārāja had at least seven days' guarantee that he will die after seven days. But so far we are concerned, we can go on the street. There may be any accident. I can die immediately. There are, so many deaths are taking place. The death is sure, and when it will take place, that nobody knows.