Then Kausalya Âsvalâyana asked: "Sir, whence is that Prâna (spirit) born? How does it come into this body? And how does it abide, after it has divided itself? How does it go out? How does it support what is without, and how what is within?"

In plain words: A student named Kausalya Asvalayana asks the teacher about Prana, the life-force. Where does it come from? How does it enter the body, divide itself up, live there, and leave? And how does it hold up both the outer world and the inner one?