If the world were not something which, expressed _practically_, ought not to be, it would also not be _theoretically_ a problem; but its existence would either require no explanation, inasmuch as it would be so entirely self‐evident that wonder concerning it or a question about it could arise in no mind, or its end would present itself unmistakably. Instead of this, however, it is indeed an insoluble problem; for even the most perfect philosophy will yet always contain an unexplained element, like an insoluble deposit or the remainder which the irrational relation of two quantities always leaves over. Therefore if one ventures to raise the question why there is not rather nothing than this world, the world cannot be justified from itself, no ground, no final cause of its existence can be found in itself, it cannot be shown that it exists for its own sake, _i.e._, for its own advantage. In accordance with my teaching, this can certainly be explained from the fact that the principle of its existence is expressly one which is without ground, a blind will to live, which as thing in itself cannot be made subject to the principle of sufficient reason, which is merely the form of the phenomenon, and through which alone every why is justified. But this also agrees with the nature of the world, for only a blind will, no seeing will, could place itself in the position in which we behold ourselves. A seeing will would rather have soon made the calculation that the business did not cover the cost, for such a mighty effort and struggle with the straining of all the powers, under constant care, anxiety, and want, and with the inevitable destruction of every individual life, finds no compensation in the ephemeral existence itself, which is so obtained, and which passes into nothing in our hands. Hence, then, the explanation of the world from the Anaxagorean νους, _i.e._, from a will accompanied by _knowledge_, necessarily demands optimism to excuse it, which accordingly is set up and maintained in spite of the loudly crying evidence of a whole world full of misery. Life is there given out to be a gift, while it is evident that every one would have declined such a gift if he could have seen it and tested it beforehand; just as Lessing admired the understanding of his son, who, because he had absolutely declined to enter life, had to be forcibly brought into it with the forceps, but was scarcely there when he hurried away from it again. On the other hand, it is then well said that life should be, from one end to the other, only a lesson; to which, however, any one might reply: “For this very reason I wish I had been left in the peace of the all‐sufficient nothing, where I would have had no need of lessons or of anything else.” If indeed it should now be added that he must one day give an account of every hour of his life, he would be more justified in himself demanding an account of why he had been transferred