Let a man meditate on mind as Brahman (n.), this is said with reference to the body. Let a man meditate on the ether as Brahman (n.), this is said with reference to the Devas. Thus both the meditation which has reference to the body, and the meditation which has reference to the Devas, has been taught.

In plain words: A person should meditate on the mind as Brahman, the ultimate reality, when thinking about the body. He should meditate on space as Brahman when thinking about the world of the gods.