Art is always and everywhere the secret confession, and at the same time the immortal movement of its time.

Paraphrased and misattributed, actually from "Die Musik des neunzehnten Jahrhunderts und ihre Pflege: Methode der Musik" ("The Music of the Nineteenth Century, and its Culture") by Adolf Bernhard Marx: "Die Kunst ist stets und überall das geheime Bekenntnis und unsterbliche Denkmal ihrer Zeit." ("Art is always and everywhere the secret confession as well as the undying monuments of its time.").