On the Fourfold Root of the Principle of Sufficient...

Conceptions must not be confounded with pictures of the imagination, these being intuitive and complete, therefore individual representations, although they are not called forth by sensuous impressions and do not therefore belong to the complex of experience. Even when used to represent a conception, a picture of the imagination (phantasm) ought to be distinguished from a conception. We use phantasms as representatives of conceptions when we try to grasp the intuitive representation itself that has given rise to the conception and to make it tally with that conception, which is in all cases impossible; for there is no representation, for instance, of dog in general, colour in general, triangle in general, number in general, nor is there any picture of the imagination which corresponds to these conceptions. Then we evoke the phantasm of some dog or other, which, as a representation, must in all cases be determined: that is, it must have a certain size, shape, colour, &c. &c.; even though the conception represented by it has no such determinations. When we use such representatives of conceptions however, we are always conscious that they are not adequate to the conceptions they represent, and that they are full of arbitrary determinations. Towards the end of the first part of his Twelfth Essay on Human Understanding, Hume expresses himself in agreement with this view, as also Rousseau in his "Discours sur l'Origine de l'Inégalité."[120] Kant's doctrine, on the contrary, is a totally different one. The matter is one which introspection and clear reflection can alone decide.

Each of us must therefore examine himself as to whether he is conscious in his own conceptions of a "Monogram of Pure Imagination à priori;" whether, for instance, when he thinks dog, he is conscious of something entre chien et loup; or whether, as I have here explained it, he is either thinking an abstract conception through his Reason, or representing some representative of that conception as a complete picture through his imagination.

All thinking, in a wider sense: that is, all inner activity of the mind in general, necessitates either words or pictures of the imagination: without one or other of these it has nothing to hold by. They are not, however, both necessary at the same time, although they may co-operate to their mutual support. Now, thinking in a narrower sense—that is, abstract reflection by means of words—is either purely logical reasoning, in which case it keeps strictly to its own sphere; or it touches upon the limits of perceptible representations in order to come to an understanding with them, so as to bring that which is given by experience and grasped by perception into connection with abstract conceptions resulting from clear reflection, and thus to gain complete possession of it. In thinking therefore, we seek either for the conception or rule to which a given perception belongs, or for the particular case which proves a given conception or rule. In this quality, thinking is an activity of the faculty of judgment, and indeed in the first case a reflective, in the second, a subsuming activity. The faculty of judgment is accordingly the mediator between intuitive and abstract knowledge, or between the Understanding and the Reason. In most men it has merely rudimentary, often even merely nominal existence;[121] they are destined to follow the lead of others, and it is as well not to converse with them more than is necessary.

The true kernel of all knowledge is that reflection which works with the help of intuitive representations; for it goes back to the fountain-head, to the basis of all conceptions. Therefore it generates all really original thoughts, all primary and fundamental views and all inventions, so far as chance had not the largest share in them. The Understanding prevails in this sort of thinking, whilst the Reason is the chief factor in purely abstract reflection. Certain thoughts which wander about for a long time in our heads, belong to this sort of reflection: thoughts which come and go, now clothed in one kind of intuition, now in another, until they at last become clear, fix themselves in conceptions and find words to express them. Some, indeed, never find words to express them, and these are, unfortunately, the best of all: quæ voce meliora sunt, as Apuleius says.

Aristotle, however, went too far in thinking that no reflection is possible without pictures of the imagination. Nevertheless, what he says on this point,[122] οὐδέποτε νοεῖ ἄνευ φαντάσματος ἡ ψυχή (anima sine phantasmate nunquam intelligit),[123] and ὅταν θεωρῇ, ἀνάγκη ἅμα φάντασμά τι θεωρεῖν (qui contemplatur, necesse est, una cum phantasmate contempletur),[124] and again, νοεῖν οὐκ ἔστι ἄνευ φαντάσματος (fieri non potest, ut sine phantasmate quidquam intelligatur),[125]—made a strong impression upon the thinkers of the fifteenth and sixteenth centuries, who therefore frequently and emphatically repeat what he says. Pico della Mirandola,[126] for instance, says: Necesse est, eum, qui ratiocinatur et intelligit, phantasmata speculari;—Melanchthon[127] says: Oportet intelligentem phantasmata speculari;—and Jord. Brunus[128] says, dicit Aristoteles: oportet scire volentem, phantasmata speculari. Pomponatius[129] expresses himself in the same sense.—On the whole, all that can be affirmed is, that every true and primary notion, every genuine philosophic theorem even, must have some sort of intuitive view for its innermost kernel or root. This, though something momentary[130] and single, subsequently imparts life and spirit to the whole analysis, however exhaustive it may be,—just as one drop of the right reagent suffices to tinge a whole solution with the colour of the precipitate which it causes.

When an analysis has a kernel of this sort, it is like a bank note issued by a firm which has ready money wherewith to back it; whereas every other analysis proceeding from mere combinations of abstract conceptions, resembles a bank note which is issued by a firm which has nothing but other paper obligations to back it with. All mere rational talk thus renders the result of given conceptions clearer, but does not, strictly speaking, bring anything new to light. It might therefore be left to each individual to do himself, instead of filling whole volumes every day.