“There is no such thing as abstract art, or else all art is abstract, which amounts to the same thing. Abstract art no more exists than does curved art yellow art or green art.”

On how art might turn “dangerous” if it becomes too political in “In Memoriam: An Interview with the Late Amiri Baraka” https://www.sampsoniaway.org/interviews/2014/01/10/in-memoriam-an-interview-with-the-late-amiri-baraka/ in Sampsonia Way (2014 Jan 10)

Source: 1940 - 1950, The Plasmic Image 1. 1943-1945, p. 139

Source: undated quotes, Tàpies, Werke auf Papier 1943 – 2003,' (2004), p. 25.

Source: The Lady, Her Lover, and Her Lord

Quote of Ad Reinhardt (1963); as cited in: Joseph Kosuth, (1969), " Art after Philosophy http://www.ubu.com/papers/kosuth_philosophy.html"
1956 - 1967
Variant: The one thing to say about art is that it is one thing. Art is art-as-art and everything else is everything else. Art as art is nothing but art. Art is not what is not art.

Source: 1956 - 1967, Art-as-Art Dogma' part II, (1964), p. 158

Diary entry (1915), # 951 , in The Diaries of Paul Klee, translation: Pierre B. Schneider, R. Y. Zachary and Max Knight; publisher, University of California Press, 1964
1916 - 1920
Variant: The more horrifying this world becomes (as it is these days) the more art becomes abstract; while a world at peace produces realistic art.
Variant: The more horrifying this world becomes, the more art becomes abstract; while a world at peace produces realistic art. (this variant was quoted in the speech "Between Two Ages: The Meaning Of Our Times" by Wm. Van Dusen Wishard) http://www.commonwealthnorth.org/transcripts/wishard.html

1910's, Natural Reality and Abstract Reality', 1919