In the same way that our being consists of two principles and natures, so also and consequently our feelings are divided into two kinds, entirely different. As reasonable beings we experience a feeling of approbation or of disapprobation; as sensuous creatures we experience pleasure or displeasure. The two feelings, approbation and pleasure, repose on satisfaction: one on a satisfaction given to a requirement of reason-- reason has only requirements, and not wants. The other depends on a satisfaction given to a sensuous want--sense only knows of wants, and cannot prescribe anything. These two terms--requirements of reason, wants of the senses--are mutually related, as absolute necessity and the necessity of nature. Accordingly, both are included in the idea of necessity, but with this difference, that the necessity of reason is unconditional, and the necessity of sense only takes place under conditions. But, for both, satisfaction is a purely contingent thing. Accordingly every feeling, whether of pleasure or approbation, rests definitively on an agreement between the contingent and the necessary. If the necessary has thus an imperative character, the feeling experienced will be that of approbation. If necessity has the character of a want, the feeling experienced will be that of pleasure, and both will be strong in proportion as the satisfaction will be contingent. Now, underlying every moral judgment there is a requirement of reason which requires us to act conformably with the moral law, and it is an absolute necessity that we should wish what is good. But as the will is free, it is physically an accidental thing that we should do in fact what is good. If we actually do it, this agreement between the contingent in the use of free will and the imperative demand of reason gives rise to our assent or approbation, which will be greater in proportion as the resistance of the inclinations made this use that we make of our free will more accidental and more doubtful. Every aesthetic judgment, on the contrary, refers the object to the necessity which cannot help willing imperatively, but only desires that there should be an agreement between the accidental and its own interest. Now what is the interest of imagination? It is to emancipate itself from all laws, and to play its part freely. The obligation imposed on the will by the moral law, which prescribes its object in the strictest manner, is by no means favorable to this need of independence. And as the moral obligation of the will is the object of the moral judgment, it is clear that in this mode of judging, the imagination could not find its interest. But a moral obligation imposed on the will cannot be conceived, except by supposing this same will absolutely independent of the moral instincts and from their constraint. Accordingly the possibility of the moral act requires liberty, and therefore agrees here in the most perfect manner with the interest of imagination.