The Christian and the non-Christian notions of mystery are as the poles apart. The Christian notion rests on the presupposition of the existence of the self-contained ontological trinity of God, who dwells in light that no man can approach unto. The non-Christian notion rests on the assumption of the existence of would-be autonomous man who has not yet exhaustively interpreted the realms of ultimate chance. The Greeks held to the latter notion. The very notion of God, as Aristotle held to it, is