This book belongs to the most rare of men. Perhaps not one of them is yet alive. It is possible that they may be among those who understand my “Zarathustra”: how could I confound myself with those who are now sprouting ears?—First the day after tomorrow must come for me. Some men are born posthumously. The conditions under which any one understands me, and necessarily understands me—I know them only too well. Even to endure my seriousness, my passion, he must carry intellectual integrity to the verge of hardness. He must be accustomed to living on mountain tops—and to looking upon the wretched gabble of politics and nationalism as beneath him. He must have become indifferent; he must never ask of the truth whether it brings profit to him or a fatality to him.... He must have an inclination, born of strength, for questions that no one has the courage for; the courage for the forbidden; predestination for the labyrinth.