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In this way a twofold kind of morality was revealed to him: mere propriety of behavior and real merit in action. Merit = propriety + utility. The main conclusion is this: Sympathy is that by means of which virtue is recognized and approved, as well as that which is approved as virtue; it is ratio cognoscendi as well as ratio essendi, the criterion as well as the source of morality.

I have often remarked that the largest and most subtle source of error in philosophic speculations has been the confounding of the two great principles so much insisted on by the Leibnitzians, namely, the ratio cognoscendi and the ratio essendi.

Erdmann has given a better defense of Descartes than the philosopher himself against the charge that this is arguing in a circle, inasmuch as the existence of God is proved by the criterion of truth, and then the latter by the former: The criterion of certitude is the ratio cognoscendi of God's existence; God is the ratio essendi of the criterion of certitude.

We are not investigating an absolute principium essendi; for then, I admit, many valid objections might be started against our theory; but an absolute principium cognoscendi.

But as this is inconceivable, except in a self-consciousness, it follows, that even as natural philosophers we must arrive at the same principle from which as transcendental philosophers we set out; that is, in a self- consciousness in which the principium essendi does not stand to the principlum cognoscende in the relation of cause to effect, but both the one and the other are co-inherent and identical.

In theoretical philosophy the pure self-consciousness, the "I think," denoted a point where the thing in itself manifests to us not its nature, indeed, but its existence. The same holds true in practical philosophy of the moral law. Freedom is the ratio essendi of the self-given moral law, the latter the ratio cognoscendi of freedom.

The former distinguishes between ratio essendi and ratio cognoscendi, rejects the ontological argument, and defends determinism against Crusius on Leibnitzian grounds. It presupposes merely the two forces of matter, attraction and repulsion, and its primitive chaotic condition, a world-mist with elements of different density.

This principium commune essendi et cognoscendi, as subsisting in a WILL, or primary ACT of self-duplication, is the mediate or indirect principle of every science; but it is the immediate and direct principle of the ultimate science alone, i.e. of transcendental philosophy alone. This, it has been shown, can be found only in the act and evolution of self- consciousness.

The ratio essendi is the law which regulates the coexistence of the parts of space and the succession of the divisions of time. The ratio fiendi demands for every change of state another from which it regularly follows as from its cause, and a substance as its unchangeable substratum matter.

Paley believed himself to be assigning it was his full purpose to assign the ratio cognoscendi; but, instead of that, unconsciously and surreptitiously, he has actually assigned the ratio essendi; and, after all, a false and imaginary ratio essendi.