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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.

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.

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.

As each man's whole experience is bound to his body no less than is the most trivial optical illusion, the sphere of sense is the transcendental ground or ratio cognoscendi of every other sphere.

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.