before Him, a man enlightened by Him who is the Light. For of John it is said, “He was not the Light, but that he should bear witness of the Light.” He may himself be called a light indeed, and rightly so; but an enlightened, not an enlightening light. The light that enlightens, and that which is enlightened, are different things: for even our eyes are called lights (lumina), and yet when we open them in the dark, they do not see. But the light that enlightens is a light both from itself and for itself, and does not need another light for its shining; but all the rest need it, that they may shine.