From Schiller's letters on aesthetics

"Now the term natural condition can be applied to every political body which owes its establishment originally to forces and not to laws, and such a state contradicts the moral nature of man, because lawfulness can alone have authority over this. At the same time this natural condition is quite sufficient for the physical man, who only gives himself laws in order to get rid of brute force. Moreover, the physical man is a reality, and the moral man problematical. Therefore when the reason suppresses the natural condition, as she must if she wishes to substitute her own, she weighs the real physical man against the problematical moral man, she weighs the existence of society against a possible, though morally necessary, ideal of society. She takes from man something which he really possesses, and without which he possesses nothing, and refers him as a substitute to something that he ought to possess and might possess; and if reason had relied too exclusively on him she might, in order to secure him a state of humanity in which he is wanting and can want without injury to his life, have robbed him even of the means of animal existence, which is the first necessary condition of his being a man. Before he had opportunity to hold firm to the law with his will, reason would have withdrawn from his feet the ladder of nature."