Long ago Dostoevsky pointed out that the instinct of destruction is as natural to the human soul as that of creation. Beside these two instincts all our faculties appear to be minor psychological properties, required only under given, and accidental, conditions. Of truth--as not only the crass materialists now confess, but the idealists also have found in their metaphysic--nothing remains but the idea of the norm.--To speak in more expressive and intelligible language, truth exists only in order that men who are separated in time and space might establish between themselves some kind of communication at least. That is, a man must choose between absolute loneliness with truth, on the one side, and communion with his neighbours and falsehood, on the other. Which is the better, it will be asked. The question is idle, I reply. There is a third way still: to accept both, though it may at first appear utterly absurd, especially to people who have once for all decided that logic, like mathematics, is infallible. Whereas it is possible, and not merely possible--we would not be content with a possibility: only a German idealist can be satisfied with a good which was never realised in any place at all--it is continually observed that the most contradictory spiritual states do coexist. All men lie when they begin to speak: our language is so imperfectly arranged that the principle of its arrangement presupposes a readiness to speak untruth. The more abstract the subject is, the more does the disposition to lie increase, until, when we touch upon the most complicated questions, we have to lie incessantly, and the lie is the more intolerable and coarse the more sincere we are. For a sincere man is convinced that veracity is assured by the absence of contradictions, and in order to avoid all appearance of lie, he tries to make a logical agreement between his opinions: that is to raise his lie to Herculean heights. In his turn, when he receives the opinions of others, he applies the same criterion, and the moment he notices the smallest contradiction, he begins naively to cry out against the violation of the fundamental decencies. What is particularly curious is that all the learned students of philosophy--and it is strictly to them that I address myself here, as the reader has probably observed long ago--certainly are well aware that no single one of the mightiest philosophers has hitherto succeeded in eliminating all contradictions from his system. How well armed was Spinoza! He spared no effort, and stuck at nothing, and yet his remarkable system will not bear logical criticism. That is a matter of common knowledge. So it appears that we ought to ask what the devil is the use of consistency, and whether contradictions are not the condition of truthfulness in one's conception of the world. And after Kant, his disciples and successors might have answered quietly that the devil alone knows the use of consistency, and that truth lives by contradictions.