“One cannot condemn tendencies in art; one can only condemn works of art. To be categorically against a current art tendency or style means, in effect, to pronounce on works of art not yet created and not yet seen. It means inquiring into the motives of artists instead of into results. Yet we all know — or are supposed to know — that results are all that count in art.”

The Principles of Success in Literature (1865)

Art after Philosophy, 1969

Joseph Kosuth, “Introduction” in Art After Philosophy and After: Collected Writings, 1960–1990 (Cambridge: MIT Press, 1991); cited in: Thierry Mortier. " Semiotics as Art: Kosuth http://www.semionaut.net/semiotics-as-art-joseph-kosuth/," Sunday, 1 July 2012.

Bachelors
A Guide to Men (1922)

Quotes of Sol Lewitt, "Sol LeWitt by Saul Ostrow," 2003

E M Forster -0bituary of Roger Fry ,1940 ,'Biography of RogerFry'by Virginia Wolf , Harcourt, Brace and Co, New York 1940.
Art Quotes

version in Dutch (citaat van Israëls, in het Nederlands): Ik geloof niet in joodse kunst. Er zijn joodse kunstenaars, d.w.z. kunstenaars die joods geboren zijn, maar dat wil nog niet zeggen dat hun werk joodse kunst is.
Quote of Jozef Israëls, 9 July 1907, translated from his letter (written in German) to the committee of the Exhibition for Jewish Art in Berlin; as cited in Jozef Israëls, 1824 – 1911, ed. Dieuwertje Dekkers; Waanders, Zwolle 1999, p. 55
Jozef Israëls was Jewish himself, but refused to call his art Jewish as the Zionist movement liked to call it
Quotes of Jozef Israels, after 1900

And we can only talk about its components rather arbitrarily, dividing it up artificially or the sake of theoretical discussion.
Source: Sculpting in Time (1986), p. 114