the world outside himself and contemplates it, does he detach his personality from the rest; then a world appears to him, since he is no longer one with the world."[7] [Sidenote: _Æsthetic education._] Schiller ascribed high educational value to art thus conceived as at once sensible and rational, material and formal. Not that it teaches moral precepts or excites to good actions; if it acted thus, or when it acted thus, it would at once cease, as we have seen, to be art. Determination in whatsoever direction, to the good or the bad, to pleasure or to duty, destroys the character of the æsthetic sphere, which is rather indeterminism. By means of art man frees himself from the yoke of the senses; but before putting himself spontaneously under that of reason and duty, he takes as it were a little breathing-space by staying in a region of indifference and serene contemplation. "While having no claim to promote exclusively any special human faculty, the æsthetic condition is favourable to each and all without favouritism; and the reason why it favours none in particular is that it is the foundation of the possibility of all alike. Every other exercise gives some inclination to the soul, and therefore presupposes a special limit; æsthetic activity alone is unlimited." This indifference, which if not yet pure form is not pure matter, confers its educational value on art; it opens a way to morality, not by preaching and persuading, that is to say, determining, but by making determination possible. Such is the fundamental concept of his celebrated _Letters on the Æsthetic Education of Man_ (1795), in which Schiller took his cue from the conditions of his times and from the necessity of finding a middle way between supine acquiescence in tyranny and savage rebellion as exemplified by the revolution then raging in France. [Sidenote: _Vagueness and lack of precision in Schiller's Æsthetic._]