Next, of this breath water is the body, light the form, viz. this moon. And so far as this breath extends, so far extends water, so far extends the moon. These are all alike, all endless. And he who worships them as finite, obtains a finite world, but he who worships them as infinite, obtains an infinite world.

In plain words: Breath has water as its body and the moon as its light. Speech, mind, and breath are equal and endless. If you think of them as small and limited, you get a small life. If you see them as endless, you get an endless world.