our arbitrary will in respect of the moral law, viz. of transcendental freedom, is already, in kind, an indemonstrable concept and a rational Idea; while virtue is so, in degree. For there can be given in experience, as regards its quality, absolutely nothing corresponding to the former; whereas in the latter case no empirical product attains to the degree of that causality, which the rational Idea prescribes as the rule.

As in a rational Idea the Imagination with its intuitions does not attain to the given concept, so in an aesthetical Idea the Understanding by its concepts never attains completely to that internal intuition which the Imagination binds up with a given representation. Since, now, to reduce a representation of the Imagination to concepts is the same thing as to expound it, the