The understanding also is constantly being explained anew. In seven passages of the “Critique of Pure Reason” it is explained in the following terms. On p. 51; V. 75, it is the faculty which of itself produces ideas of perception. On p. 69; V. 94, it is the faculty of judging, _i.e._, of thinking, _i.e._, of knowing through conceptions. On p. 137 of the fifth edition, it is the faculty of knowledge generally. On p. 132; V. 171, it is the faculty of rules. On p. 158; V. 197, however, it is said: “It is not only the faculty of rules, but the source of principles (_Grundsätze_) according to which everything comes under rules;” and yet above it was opposed to the reason because the latter alone was the faculty of principles (_Principien_). On p. 160; V. 199, the understanding is the faculty of conceptions; but on p. 302; V. 359, it is the faculty of the unity of phenomena by means of rules. Against such really confused and groundless language on the subject (even though it comes from Kant) I shall have no need to defend the explanation which I have given of these two faculties of knowledge—an explanation which is fixed, clearly defined, definite, simple, and in full agreement with the language of all nations and all ages. I have only quoted this language as a proof of my charge that Kant follows his symmetrical, logical system without sufficiently reflecting upon the subject he is thus handling. Now, as I have said above, if Kant had seriously examined how far two such different faculties of knowledge, one of which is the specific difference of man, may be known, and what, in accordance with the language of all nations and all philosophers, reason and understanding are, he would never, without further authority than the _intellectus theoreticus_ and _practicus_ of the Schoolmen, which is used in an entirely different sense, have divided the reason into theoretical and practical, and made the latter the source of virtuous conduct. In the same way, before Kant separated so carefully conceptions of the understanding (by which he sometimes means his categories, sometimes all general conceptions) and conceptions of the reason (his so-called Ideas), and made them both the material of his philosophy, which for the most part deals only with the validity, application, and origin of all these conceptions;—first, I say, he ought to have really examined what in general a _conception_ is. But this very necessary investigation has unfortunately been also neglected, and has contributed much to the irremediable confusion of intuitive and abstract knowledge which I shall soon refer to. The same want of adequate reflection with which he passed over the questions: what is perception? what is reflection? what is conception? what is reason? what is understanding? allowed him to pass over the following investigations, which were just as inevitably necessary: what is it that I call the _object_, which I distinguish from the _idea_? what is existence? what is