In the Bhagavad-gītā also it is stated, yaṁ yaṁ vāpi smaran loke tyajaty ante kalevaram (BG 8.6). At the time of death the situation of mental situation, according to that mental situation he gets the next body. How? The example is: just like air passing over a nice rose garden. The air is carrying the flavor of the rose garden. And if the air is passing through some filthy place, stool, urine, then it carries the smell of stool and urine. The air is pure, but according to the blowing of the air under certain situation, it is carrying the flavor, or smell, a bad smell or good smell.
Similarly, we spirit souls, we are all parts and parcel of the Supreme Lord. Therefore, qualitatively we are one. If God is gold, then I am also gold. How can I be otherwise? Because I am part and parcel. If God is iron, then I am also iron. That is my position. But as I am carrying different airs by my association with this material nature, I am getting a different body. It is very simple to understand.
We are getting different bodies, that's a fact. Even in our present life we have passed through so many different bodies: a baby's body, a child's body, a boy's body, young man's body. All those bodies are gone. Now I am undergoing in a old man's body. Similarly, when this body will be useless for any purpose, then I accept another body. This is called transmigration of the soul. So for another body, that will be created according to the mental situation we made here at the present body—just like the same air passing through rose garden and air passing through a toilet room.
Therefore, this human form of body is specially meant for creating a favorable situation so that when we pass through this body, or we leave this body, and we accept another body, we'll get exact a body like Kṛṣṇa. That is Kṛṣṇa consciousness movement. We are trying to change the consciousness of the people so that this preparation will help him to get exactly a body like Kṛṣṇa in next life, and he may dance with Kṛṣṇa in rāsa dance. That is our propaganda.