Nietzsche’s fifth ruling idea is most clearly expressed in the book that he wrote for his friend. He summed it up in the words Amor Fati, the acceptance of life, be it what it might, a joyful “yea-saying” to all its pronouncements, written in the most cruel facts though they might be. Now this, as he pointed out, is the attitude of the tragic artist, whose work is the expression not of pity but of a proud acquiescence, an acquiescence that is an intellectual conquest. He wished men to be artists in their attitude towards life, and this desire brought his writings on art nearer to “the business and bosoms of men” than the discreet distance from these things usually preserved by aesthetic theory. His _Birth of Tragedy_ was not merely an historical speculation, but offered for the criticism of life words that Nietzsche applied for the moment to the criticism of art. These words were “Apollonian” and “Dionysian.” The latter word has been persistently applied to Nietzsche himself, though he saw “in the fraternal union of Apollo and Dionysus the climax of the Apollonian as well as of the Dionysian artistic aims.” What does he mean by this antithetical conception? Let me answer by two quotations: 1. “It is in connection with Apollo and Dionysus, the two art-deities of the Greeks, that we learn that there existed in the Grecian world a wide antithesis, in origin and aims, between the art of the shaper, the Apollonian, and the non-plastic art of music, that of Dionysus: both these so heterogeneous tendencies were parallel to each other, for the most part openly at variance, and continually inciting each other to new and more powerful births, to perpetuate in them the strife of this antithesis, which is but seemingly bridged over by their mutual term ‘Art’; till at last, by a metaphysical miracle of the Hellenic will, they appear paired with each other, and through this pairing eventually generate the equally Dionysian and Apollonian art-work of Attic tragedy.” 2. “In contrast to all those who are intent on deriving the arts from one exclusive principle, as the necessary vital source of every work of art, I keep my eyes fixed on the two artistic deities of the Greeks, Apollo and Dionysus, and recognise in them the living and conspicuous representatives of _two_ worlds of art which differ in their intrinsic essence and in their highest aims. Apollo stands before me as the transfiguring genius of the _principium individuationis_ through which alone the redemption in appearance is to be truly attained, while by the mystical cheer of Dionysus the spell of individuation is broken, and the way lies open to the Mothers of Being, to the innermost heart of things.”