I have just read your book [On the Spiritual in Art] from cover to cover, and I will read it once more. I find it pleasing to an extraordinary degree, because we agree on nearly all of the main issues..

In a letter to Wassily Kandinsky, 18 Dec. 1911; as quoted in Schönberg and Kandinsky: An Historic Encounter, by Klaus Kropfinger; edited by Konrad Boehmer; published by Routledge (imprint of Taylor & Francis, an Informa Group company), 2003, p. 15-16 note 49