The mind “evolves” itself from error to truth by what might be called a system of contradictions, according to Hegel, with respect to logic as well as to morality; the sum of such contradictions becoming smaller and less complicated with every single step of this evolution. No doubt there really occurs a process of logical and moral refining, so to say, in the individual, and no doubt also, the results of this process, as far as attained, can be handed down to the next generation by the spoken word or by books. But it is by no means clear, I think, that this process is of the type of a real evolution towards an end, so far as it relates to the actual series of generations as such. On the contrary, it seems to me that we have here simply what we meet everywhere in history--a sort of cumulation resting upon a psychological basis. The dissatisfaction that exists at any actual stage of contradiction, both moral and logical, is one of the psychical factors concerned; the faculty of reasoning is the other. Now it is a consequence of the reasoning faculty that the dissatisfaction continually decreases, or at least changes in such a way that each partial result of the logical process brings with it the statement of new problems. The number of such problems may become less, as the logical process advances, and, indeed, there is an ideal state, both logical and moral, in which there are no more problems, but only results, though this ideal could hardly be regarded as attainable by the *human* mind. In the history of those sciences which are wholly or chiefly of the *a priori* type, this process of deliverance from contradictions is most advantageously to be seen. It is obvious in mechanics and thermodynamics, and the theory of matter is another very good instance. A certain result is reached; much seems to be gained, but suddenly another group of facts presents itself, which had been previously unknown or neglected. The first result has to be changed or enlarged; many problems of the second order arise; there are contradictions among them, which disappear after a certain alteration of what was the first fundamental result, and so on. And the same is true about morality, though the difficulties are much greater here, as a clear and well-marked standard of measurement of what is good and what is bad, is wanting, or at least, is not conceded unanimously. But even here there is a consensus on some matters: one would hardly go back to slavery again, for instance, and there are still other points in morality which are claimed as ideals at least by a great majority of moral thinkers.