Revelation (not the book)

He [God] is the Creator who makes all things, but He transcends His own creation. He is not involved in the flux and flow of the universe. There is an infinite qualitative distinction between Him and what He has created, an infinite ontological distinction between them. He is one order of being and the creation is another. There is a discontinuity between them.

That is the reason revelation is so crucial; there is a gulf between us and Him that we cannot cross. If we are ever to know Him, He must come down to us. That chasm is uncrossable apart from revelation. He must reveal Himself, and that is what we are getting in the Scripture.— Lectures in Old Testament Theology, page 95