But, on the other side, man, as far as he is a phenomenon, is an object of sense; there, where the _moral_ sentiment is satisfied, the æsthetic sentiment does not understand its being made a sacrifice, and the concomity with an idea ought not to lessen the beauty of the phenomenon. Thus, as much as reason requires an expression of the morality of the subject in the human face, so much, and with no less rigor, does the eye demand beauty. As these two requirements, although coming from the principles of the appreciation of different degrees, address themselves to the same object, also both one and the other must be given satisfaction by one and the same cause. The disposition of the soul which places man in the best state for accomplishing his moral destiny ought to give place to an expression that will be at the same time the most advantageous to his beauty as phenomenon; in other terms, his moral exercise ought to be revealed by _grace_. But a great difficulty now presents itself from the idea alone of the expressive movements which bear witness to the morality of the subject: it appears that the cause of these movements is necessarily a moral cause, a principle which resides beyond the world of sense; and from the sole idea of beauty it is not less evident that its principle is purely sensuous, and that it ought to be a simple effect of nature, or at the least appear to be such. But if the ultimate reason of the movements which offer a moral expression is necessarily _without_, and the ultimate reason of the beautiful necessarily _within_, the sensuous world, it appears that _grace_, which ought to unite both of them, contains a manifest contradiction.