A judgment is synthetic—that is to say, it co-ordinates various ideas. It is a priori—that is to say, this co-ordination is universally true and necessary, and is arrived at, not by sensual experience, but by pure reason.
If there are such things as a priori judgments, then reason must be able to co-ordinate: co-ordination is a form. Reason must possess a formative faculty.
531.
Judging is our oldest faith; it is our habit of believing this to be true or false, of asserting or denying, our certainty that something is thus and not otherwise, our belief that we really "know"—what is believed to be true in all judgments?
What are attributes?—We did not regard changes in ourselves merely as such, but as "things in themselves," which are strange to us, and which we only "perceive"; and we did not class them as phenomena, but as Being, as "attributes"; and in addition we invented a creature to which they attach themselves—that is to say, we made the effect the working cause, and the latter we made Being. But even in this plain statement, the concept "effect" is arbitrary: for in regard to those changes which occur in us, and of which we are convinced we ourselves are not the cause, we still argue that they must be effects: and this is in accordance with the belief that "every change must have its author";—but this belief in itself is already mythology; for it separates the working cause from the cause in work. When I say the "lightning flashes," I set the flash down, once as an action and a second time as a subject acting; and thus a thing is fancifully affixed to a phenomenon, which is not one with it, but which is stable, which is, and does not "come."—To make the phenomenon the working cause, and to make the effect into a thing—into Being: this is the double error, or interpretation, of which we are guilty.
532.
The Judgment—that is the faith: "This and this is so. In every judgment, therefore, there lies the admission that an "identical" case has been met with: it thus takes some sort of comparison for granted, with the help of the memory. Judgment does not create the idea that an identical case seems to be there. It believes rather that it actually perceives such a case; it works on the hypothesis that there are such things as identical cases. But what is that much older function called, which must have been active much earlier, and which in itself equalises unequal cases and makes them alike? What is that second function called, which with this first one as a basis, etc. etc, "That which provokes the same sensations as another thing is equal to that other thing": but what is that called which makes sensations equal, which regards them as equal?—There could be no judgments if a sort of equalising process were not active within all sensations: memory is only possible by means of the underscoring of all that has already been experienced and learned. Before a judgment can be formed, the process of assimilation must already have been completed: thus, even here, an intellectual activity is to be observed which does not enter consciousness in at all the same way as the pain which accompanies a wound. Probably the psychic phenomena correspond to all the organic functions—that is to say, they consist of assimilation, rejection, growth, etc.
The essential thing is to start out from the body and to use it as the general clue. It is by far the richer phenomenon, and allows of much more accurate observation. The belief in the body is much more soundly established than the belief in spirit.
"However strongly a thing may be believed, the degree of belief is no criterion of its truth." But what is truth? Perhaps it is a form of faith, which has become a condition of existence? Then strength would certainly be a criterion; for instance, in regard to causality.