With Nietzsche reason deliberately abdicates, bearing with it into exile its categories of good and evil, cause and end. Schopenhauer had suggested to him that the true key to the riddle of existence was not intellect but will; behind the mask of phenomena the illuminated spirit discerned not a Contriving but a Striving, a monstrous Will, blind as old Œdipus, yearning like him through blood and anguish to a possible redemption. But in time he cast off Schopenhauer and pessimism. The Will to Live he "construed in an optimistic sense," and it darkened into that other mystery, at once vaguer and more malign, the Will to Power. The problem remained to find a ground for optimism, and a clue to the harmony, to the recurring rhythms and patterns of reality as we know it. So was born what is perhaps the characteristic idea of Nietzsche. The universe is not a phenomenon of Will, it is a phenomenon of Art. "In my preface to the book on Wagner I had already," wrote Nietzsche in 1886, "presented art, and not morality, as the essentially metaphysical activity of man: in the course of the present book I reproduce in many forms the singular proposition that the world is only to be justified as an artistic phenomenon." For the optimist _quand-même_ this interpretation has many advantages. Cruelty, sorrow and disaster need no longer dismay him; since a world may at the same time be a very bad world and a very good tragedy. "It may be," the lyricist, turned philosopher, wrote later, "that my _Zarathustra_ ought to be classified under the rubric Music." These two passages, with a hundred others, determine the atmosphere into which we are introduced. We have to deal not with a thinker who expounds a system, but with a prophet who dispenses a Revelation: Nietzsche is not the apologist but the mystic of Neo-Paganism.