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attempted with no better success than attended the essay of David to wear the armour of Saul, Another use however is possible and of far greater promise, namely, the actual application of the positions which had so wonderfully enlarged the discoveries of geometry, mutatis mutandis, to philosophical subjects. Kant having briefly illustrated the utility of such an attempt in the questions of space, motion, and infinitely small quantities, as employed by the mathematician, proceeds to the idea of negative quantities and the transfer of them to metaphysical investigation. Opposites, he well observes, are of two kinds, either logical, i. e. such as are absolutely incompatible; or real without being contradictory. The former he denominates Nihil negativum irrepræsentabile, the connexion of which produces nonsense. A body in motion is something-Aliquid cogitabile; but a body, at one and the same time in motion and not in motion, is nothing, or at most, air articulated into nonsense. But a motory force of a body in one direction, and an equal force of the same body in an opposite direction is not incompatible, and the result, namely rest, is real and representable. For the purposes of mathematical calculus it is indifferent which force we term negative, and which positive, and consequently we appropriate the latter to that, which happens to be the principal object in our
thoughts. Thus if a man's capital be ten and his debts eight, the subtraction will be the same, whether we call the capital negative debt, or the debt negative capital. But in as much as the latter stands practically in reference to the former, we of course represent the sum as 10--8. It is equally clear that two equal forces acting in opposite directions, both being finite and each distinguished from the other by its direction only, must neutralize or reduce each other to inaction. Now the transcendental philosophy demands; first, that two forces should be conceived which counteract each other by their essential nature; not only not in consequence of the accidental direction of each, but as prior to all direction, nay, as the primary forces from which the conditions of all possible directions are derivative and deducible: secondly, that these forces should be assumed to be both alike infinite, both alike indestructible. The problem will then be to discover the result or product of two such forces, as distinguished from the result of those forces which are finite, and derive their difference solely from the circumstance of their direction. When we have formed a scheme or outline of these two different kinds of force, and of their different results by the process of discursive reasoning, it will then remain for us to elevate the Thesis from notional to actual, by contemplating in
tuitively this one power with its two inherent indestructible yet counteracting forces, and the results or generations to which their inter-penetration gives existence, in the living principle and in the process of our own self-consciousness. By what instrument this is possible the solution itself will discover, at the same time that it will reveal, to and for whom it is possible. Non omnia possumes omnes. There is a philosophic, no less than a poetic genius, which is differenced from the highest perfection of talent, not by degree but by kind.
The counteraction then of the two assumed forces does not depend on their meeting from opposite directions; the power which acts in them is indestructible; it is therefore inexhaustibly re-ebullient; and as something must be the result of these two forces, both alike infinite, and both alike indestructible; and as rest or neutralization cannot be this result; no other conception is possible, but that the product must be a tertium aliquid, or finite generation. Consequently this conception is necessary. Now this tertium aliquid can be no other than an inter-penetration of the counteracting powers, partaking of both
Thus far had the work been transcribed for the press, when I received the following letter from a friend, whose practical judgement I have
had ample reason to estimate and revere, and whose taste and sensibility preclude all the excuses which my self-love might possibly have prompted me to set up in plea against the decision of advisers of equal good sense, but with less tact and feeling.
You ask my opinion concerning your Chapter on the Imagination, both as to the impressions it made on myself, and as to those which I think it will make on the PUBLIC, i. e. that part of the public, who from the title of the work and from its forming a sort of introduction to a volume of poems, are likely to constitute the great majority of your readers,
"As to myself, and stating in the first place the effect on my understanding, your opinions and method of argument were not only so new to me, but so directly the reverse of all I had ever been accustomed to consider as truth, that even if 1 had comprehended your premises sufficiently to have admitted them, and had seen the necessity of your conclusions, I should still have been in that state of mind, which in your note, p. 75, 76, you have so ingeniously evolved, as the antithesis to that in which a man is, when he makes a bull. In your own words, I should have felt as if I had been standing on my head.
"The effect on my feelings, on the other hand,
I cannot better represent, than by supposing my-
If substance may be call'd what shadow seem'd,
"Yet after all, I could not but repeat the lines which you had quoted from a MS. poem of your