। ॥ ६ ॥
In plain words
One thing shines here, and it shines by itself: pure consciousness, light by its very nature. In mind after mind it looks like many — the way the one sun, sitting in dish after dish of water, looks like many suns. That is the ātman, eternal awareness itself. That am I.
Close to the Sanskrit
That which, being one, shines of itself, pure consciousness — though its very nature is light, [it appears] as if manifold in the intellects, just as the one sun situated in the water of shallow dishes — that Self, whose nature is eternal awareness, am I.