The Thing-in-itself (and under 'thing' is embraced even Mind and God) expresses the object when we leave out of sight all that consciousness makes of it, all its emotional aspects, and all specific thoughts of it. It is easy to see what is left,—utter abstraction, total emptiness, only described still as an 'other-world'—the negative of every image, feeling, and definite thought. Nor does it require much penetration to see that this caput mortuum is still only a product of thought, such as accrues when thought is carried on to abstraction unalloyed: that it is the work of the empty 'Ego,' which makes an object out of this empty self-identity of its own. The negative characteristic which this abstract identity receives as an object, is also enumerated among the categories of Kant, and is no less familiar than the empty identity aforesaid. Hence one can only read with surprise the perpetual remark that we do not know the Thing-in-itself. On the contrary there is nothing we can know so easily.
45.] It is Reason, the faculty of the Unconditioned, which discovers the conditioned nature of the knowledge comprised in experience. What is thus called the object of Reason, the Infinite or Unconditioned, is nothing but self-sameness, or the primary identity of the 'Ego' in thought (mentioned in § 42). Reason itself is the name given to the abstract 'Ego' or thought, which makes this pure identity its aim or object (cf. note to the preceding §). Now this identity, having no definite attribute at all, can receive no illumination from the truths of experience, for the reason that these refer always to definite facts. Such is the sort of Unconditioned that is supposed to be the absolute truth of Reason,—what is termed the Idea; whilst the cognitions of experience are reduced to the level of untruth and declared to be appearances.
Kant was the first definitely to signalise the distinction between Reason and Understanding. The object of the former, as he applied the term, was the infinite and unconditioned, of the latter the finite and conditioned. Kant did valuable service when he enforced the finite character of the cognitions of the understanding founded merely upon experience, and stamped their contents with the name of appearance. But his mistake was to stop at the purely negative point of view, and to limit the unconditionality of Reason to an abstract self-sameness without any shade of distinction. It degrades Reason to a finite and conditioned thing, to identify it with a mere stepping beyond the finite and conditioned range of understanding. The real infinite, far from being a mere transcendence of the finite, always involves the absorption of the finite into its own fuller nature. In the same way Kant restored the Idea to its proper dignity: vindicating it for Reason, as a thing distinct from abstract analytic determinations or from the merely sensible conceptions which usually appropriate to themselves the name of ideas. But as respects the Idea also, he never got beyond its negative aspect, as what ought to be but is not.
The view that the objects of immediate consciousness, which constitute the body of experience, are mere appearances (phenomena), was another important result of the Kantian philosophy. Common Sense, that mixture of sense and understanding, believes the objects of which it has knowledge to be severally independent and self-supporting; and when it becomes evident that they tend towards and limit one another, the interdependence of one upon another is reckoned something foreign to them and to their true nature. The very opposite is the truth. The things immediately known are mere appearances—in other words, the ground of their being is not in themselves but in something else. But then comes the important step of defining what this something else is. According to Kant, the things that we know about are to us appearances only, and we can never know their essential nature, which belongs to another world we cannot approach. Plain minds have not unreasonably taken exception to this subjective idealism, with its reduction of the facts of consciousness to a purely personal world, created by ourselves alone. For the true statement of the case is rather as follows. The things of which we have direct consciousness are mere phenomena, not for us only, but in their own nature; and the true and proper case of these things, finite as they are, is to have their existence founded not in themselves but in the universal divine Idea. This view of things, it is true, is as idealist as Kant's; but in contradistinction to the subjective idealism of the Critical philosophy should be termed absolute idealism. Absolute idealism, however, though it is far in advance of vulgar realism, is by no means merely restricted to philosophy. It lies at the root of all religion; for religion too believes the actual world we see, the sum total of existence, to be created and governed by God.
46.] But it is not enough simply to indicate the existence of the object of Reason. Curiosity impels us to seek for knowledge of this identity, this empty thing-in-itself. Now knowledge means such an acquaintance with the object as apprehends its distinct and special subject-matter. But such subject-matter involves a complex inter-connexion in the object itself, and supplies a ground of connexion with many other objects. In the present case, to express the nature of the features of the Infinite or Thing-in-itself, Reason would have nothing except the categories: and in any endeavour so to employ them Reason becomes over-soaring or 'transcendent.'
Here begins the second stage of the Criticism of Reason—which, as an independent piece of work, is more valuable than the first. The first part, as has been explained above, teaches that the categories originate in the unity of self-consciousness; that any knowledge which is gained by their means has nothing objective in it, and that the very objectivity claimed for them is only subjective. So far as this goes, the Kantian Criticism presents that 'common' type of idealism known as Subjective Idealism. It asks no questions about the meaning or scope of the categories, but simply considers the abstract form of subjectivity and objectivity, and that even in such a partial way, that the former aspect, that of subjectivity, is retained as a final and purely affirmative term of thought. In the second part, however, when Kant examines the application, as it is called, which Reason makes of the categories in order to know its objects, the content of the categories, at least in some points of view, comes in for discussion: or, at any rate, an opportunity presented itself for a discussion of the question. It is worth while to see what decision Kant arrives at on the subject of metaphysic, as this application of the categories to the unconditioned is called. His method of procedure we shall here briefly state and criticise.
47.] (α) The first of the unconditioned entities which Kant examines is the Soul (see above, § 34). 'In my consciousness,' he says, 'I always find that I (1) am the determining subject: (2) am singular, or abstractly simple: (3) am identical, or one and the same, in all the variety of what I am conscious of: (4) distinguish myself as thinking from all the things outside me.'
Now the method of the old metaphysic, as Kant correctly states it, consisted in substituting for these statements of experience the corresponding categories or metaphysical terms. Thus arise these four new propositions: (a) the Soul is a substance: (b) it is a simple substance: (c) it is numerically identical at the various periods of existence: (d) it stands in relation to space.
Kant discusses this translation, and draws attention to the Paralogism or mistake of confounding one kind of truth with another. He points out that empirical attributes have here been replaced by categories: and shows that we are not entitled to argue from the former to the latter, or to put the latter in place of the former.
This criticism obviously but repeats the observation of Hume (§ 39) that the categories as a whole,—ideas of universality and necessity,—are entirely absent from sensation; and that the empirical fact both in form and contents differs from its intellectual formulation.