Art is (1) a messenger of discontent, yet (2) no teacher of new ideals, but rather (3) an inspiration to each it touches, himself to turn creator of a world-more-ideal.
Singer, Edgar A. "Esthetic and the Rational Ideal. II." The Journal of Philosophy 23.10 (1926): 258-268; Partly cited in: William Gerber. Anatomy of what We Value Most, Rodopi, 1997, p. 55