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Thus, then, without going one step further, the reader will find grounds enough for reflection and for reverence towards Kant in these two great results: 1st, That an order of ideas has been established, which all deep philosophy has demanded, even when it could not make good its claim. This postulate is fulfilled. 2ndly, The postulate is fulfilled without mysticism or Platonic reveries. Ideas, however indispensable to human needs, and even to the connection of our thoughts, which came to us from nobody knew whence, must for ever have been suspicious; and, as in the memorable instance cited from Hume, must have been liable for ever to a question of validity. But, deduced as they now are from a matrix within our own minds, they cannot reasonably fear any assaults of scepticism.

Here I shall stop. A reader new to these inquiries may think all this a trifle. But he who reflects a little, will see that, even thus far, and going no step beyond this point, the Kantian doctrine of the Categories answers a standing question hanging aloof as a challenge to human philosophy, fills up a lacuna pointed out from the era of Plato. It solves a problem which has startled and perplexed every age: viz. this–that man is in possession, nay, in the hourly exercise, of ideas larger than he can show any title to. And in another way, the reader may measure the extent of this doctrine, by reflecting that, even so far as now stated, it is precisely coextensive with the famous scheme of Locke. For what is the capital thesis of that scheme? Simply this–that all necessity for supposing immediate impressions made upon our understandings by God, or other supernatural, or antenatal, or connatal, agencies, is idle and romantic; for that, upon examining the furniture of our minds, nothing will be found there which cannot adequately be explained out of our daily experience; and, until we find something that cannot be solved by this explanation, it is childish to go in quest of higher causes. Thus says Locke: and his whole work, upon its first plan, is no more than a continual pleading of this single thesis, pursuing it through all the plausible objections. Being, therefore, as large in its extent as Locke, the reader must not complain of the transcendental scheme as too narrow, even in that limited section of it here brought under his notice.

For the purpose of repelling it, he must do one of two things: either he must show that these categories or transcendent notions are not susceptible of the derivation and genesis here assigned to them–that is, from the forms of the logos or formal understanding; or, if content to abide by that derivation, he must allege that there are other categories besides those enumerated, and unprovided with any similar parentage.

Thus much in reply to him who complains of the doctrine here stated; as, 1st, Too narrow; or, 2nd, As insufficiently established. But, 3rd, in reply to him who wishes to see it further pursued or applied, I say that the possible applications are perhaps infinite. With respect to those made by Kant himself, they are chiefly contained in his main and elementary work, the Critik der reinen Vernunft; and they are of a nature to make any man melancholy. Indeed, let a man consider merely this one notion of causation; let him reflect on its origin; let him remember that, agreeably to this origin, it follows that we have no right to view anything in rerum natura as objectively, or in itself a cause; that when, upon the fullest philosophic proof, we call A the cause of B, we do in fact only subsume A under the notion of a cause; we invest it with that function under that relation, that the whole proceeding is merely with respect to a human understanding, and by way of indispensable nexus to the several parts of our experience; finally, that there is the greatest reason to doubt, whether the idea of causation is at all applicable to any other world than this, or any other than a human experience. Let a man meditate but a little on this or other aspects of this transcendental philosophy, and he will find the steadfast earth itself rocking as it were beneath his feet; a world about him, which is in some sense a world of deception; and a world before him, which seems to promise a world of confusion, or ‘a world not realised.’ All this he might deduce for himself without further aid from Kant. However, the particular purposes to which Kant applies his philosophy, from the difficulties which beset them, are unfitted for anything below a regular treatise. Suffice it to say here, that, difficult as these speculations are from one or two embarrassing doctrines on the Transcendental Consciousness, and depressing as they are from their general tendency, they are yet painfully irritating to the curiosity, and especially so from a sort of experimentum crucis, which they yield in the progress of their development on behalf of the entire doctrine of Kant–a test which, up to this hour, has offered defiance to any hostile hand. The test or defiance which I speak of, takes the shape of certain antinomies (so they are termed), severe adamantine arguments, affirmative and negative, on two or three celebrated problems, with no appeal to any possible decision, but one, which involves the Kantian doctrines. A quaestio vexata is proposed–for instance, the infinite divisibility of matter; each side of this question, thesis and antithesis, is argued; the logic is irresistible, the links are perfect, and for each side alternately there is a verdict, thus terminating in the most triumphant reductio ad absurdum–viz. that A, at one and the same time and in the same sense, is and is not B, from which no escape is available, but through a Kantian solution. On any other philosophy, it is demonstrated that this opprobrium of the human understanding, this scandal of logic, cannot be removed. This celebrated chapter of antinomies has been of great service to the mere polemics of the transcendental philosophy: it is a glove or gage of defiance, constantly lying on the ground, challenging the rights of victory and supremacy so long as it is not taken up by any antagonist, and bringing matters to a short decision when it is.