And yet, for all his dissent, for all his instinctive revolt against the resignationism which overwhelmed him for an hour, Nietzsche nevertheless carried away with him, and kept throughout his life, some touch of Schopenhauer's distrust of the search for happiness. Nine years after his great discovery we find him quoting and approving his teacher's words: "A happy life is impossible; the highest thing that man can aspire to is a _heroic_ life." And still later we find him thundering against "the green-grazing happiness of the herd." What is more, he gave his assent later on, though always more by fascination than by conviction, to the doctrine of eternal recurrence, the most hopeless idea, perhaps, ever formulated by man. But in all this a certain distinction is to be noted: Schopenhauer, despairing of the happy life, renounced even the heroic life, but Nietzsche never did anything of the sort. On the contrary, his whole philosophy is a protest against that very despair. The heroic life may not bring happiness, and it may even fail to bring good, but at all events it will shine gloriously in the light of its own heroism. In brief, high endeavor is an end in itself--nay, the noblest of all ends. The higher man does not work for a wage, not even for the wage of bliss: his reward is in the struggle, the danger, the aspiration. As for the happiness born of peace and love, of prosperity and tranquillity, that is for "shopkeepers, women, Englishmen and cows." The man who seeks it thereby confesses his incapacity for the loftier joys and hazards of the free spirit, and the man who wails because he cannot find it thereby confesses his unfitness to live in the world. "My formula for greatness," said Nietzsche toward the end of his life, "is _amor fati_ ... not only to bear up under necessity, but to _love_ it." Thus, borrowing Schopenhauer's pessimism, he turned it, in the end, into a defiant and irreconcilable optimism--not the slave optimism of hope, with its vain courting of gods, but the master optimism of courage.