In that summer of 1881, my brother, after many years of steadily declining health, began at last to rally, and it is to this first gush of the recovery of his once splendid bodily condition that we owe not only “The Gay Science”, which in its mood may be regarded as a prelude to “Zarathustra”, but also “Zarathustra” itself. Just as he was beginning to recuperate his health, however, an unkind destiny brought him a number of most painful personal experiences. His friends caused him many disappointments, which were the more bitter to him, inasmuch as he regarded friendship as such a sacred institution; and for the first time in his life he realised the whole horror of that loneliness to which, perhaps, all greatness is condemned. But to be forsaken is something very different from deliberately choosing blessed loneliness. How he longed, in those days, for the ideal friend who would thoroughly understand him, to whom he would be able to say all, and whom he imagined he had found at various periods in his life from his earliest youth onwards. Now, however, that the way he had chosen grew ever more perilous and steep, he found nobody who could follow him: he therefore created a perfect friend for himself in the ideal form of a majestic philosopher, and made this creation the preacher of his gospel to the world.
Whether my brother would ever have written “Thus Spake Zarathustra” according to the first plan sketched in the summer of 1881, if he had not had the disappointments already referred to, is now an idle question; but perhaps where “Zarathustra” is concerned, we may also say with Master Eckhardt: “The fleetest beast to bear you to perfection is suffering.”