THESIS I
Truth is correlative to being. Knowledge without a correspondent reality is no knowledge; if we know, there must be somewhat known by us. To know is in its very essence a verb active.
THESIS II
All truth is either mediate, that is, derived from some other truth or truths; or immediate and original. The latter is absolute, and its formula A. A.; the former is of dependent or conditional certainty, and represented in the formula B. A. The certainty, which adheres in A, is attributable to B.
SCHOLIUM. A chain without a staple, from which all the links derived their stability, or a series without a first, has been not inaptly allegorized, as a string of blind men, each holding the skirt of the man before him, reaching far out of sight, but all moving without the least deviation in one straight line. It would be naturally taken for granted, that there was a guide at the head of the file: what if it were answered, No! Sir, the men are without number, and infinite blindness supplies the place of sight?
Equally inconceivable is a cycle of equal truths without a common and central principle, which prescribes to each its proper sphere in the system of science. That the absurdity does not so immediately strike us, that it does not seem equally unimaginable, is owing to a surreptitious act of the imagination, which, instinctively and without our noticing the same, not only fills up the intervening spaces, and contemplates the cycle (of B. C. D. E. F. etc.) as a continuous circle (A.) giving to all collectively the unity of their common orbit; but likewise supplies, by a sort of subintelligitur, the one central power, which renders the movement harmonious and cyclical.
THESIS III
We are to seek therefore for some absolute truth capable of communicating to other positions a certainty, which it has not itself borrowed; a truth self-grounded, unconditional and known by its own light. In short, we have to find a somewhat which is, simply because it is. In order to be such, it must be one which is its own predicate, so far at least that all other nominal predicates must be modes and repetitions of itself. Its existence too must be such, as to preclude the possibility of requiring a cause or antecedent without an absurdity.
THESIS IV
That there can be but one such principle, may be proved a priori; for were there two or more, each must refer to some other, by which its equality is affirmed; consequently neither would be self-established, as the hypothesis demands. And a posteriori, it will be proved by the principle itself when it is discovered, as involving universal antecedence in its very conception.