“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.").
Misattributed
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Karl Marx 290
German philosopher, economist, sociologist, journalist and … 1818–1883Related quotes

“Music is the art of sounds in the movement of time.”
The Essence of Music (1923)

Source: 21st Century, Robert Rauschenberg, Works, Writings and Interviews, 2006, p. 37

Former queen of Iran on assembling Tehran's art collection http://www.guardian.co.uk/world/2012/aug/01/queen-iran-art-collection, The Guardian, (August 1, 2012).
Interviews

“Art happens all the time, everywhere. All we have to do is to keep our minds open.”
Jacek Tylicki, in "Les Krantz," The New York Art Review, 1988.

Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)

Part IV, Chapter VI
Les voix du silence [Voices of Silence] (1951)