The Social History of Art, Volume I. From Prehistoric Times to the Middle Ages, 1999, Chapter IV. The Middle Ages
“Art is higher than reality and has no direct relation to reality. To approach the spiritual in art, one will make as little use as possible of reality, because reality is opposed to the spiritual. We find ourselves in the presence of an abstract art. Art should be above reality, otherwise it would have no value for man.”
Quote of Mondrian, 1914 from Wikipedia; as cited by Michel Seuphor, in 'Piet Mondrian: Life and Work;Abrams, New York, 1956, p. 117
1910's
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Piet Mondrian 95
Peintre Néerlandais 1872–1944Related quotes

As quoted by John Gery in Ways of Nothingness: Nuclear Annihilation and Contemporary American Poetry (1996)
Context: In each art the difficulty of the form is a substitution for the difficulty of direct apprehension and expression of the object. The first difficulty may be more or less overcome, but the second is insuperable; thus every poem begins, or ought to, by a disorderly retreat to defensible positions. Or, rather, by a perception of the hopelessness of direct combat, and a resort to the warfare of spells, effigies, and prophecies. The relation between the artist and reality is an oblique one, and indeed there is no good art which is not consciously oblique. If you respect the reality of the world, you know that you can approach that reality only by indirect means.

Quote from 'A. Beuys in the wilderness', 1974 (lecture at the Ulster Museum); as cited in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 198
1970's

“Without art, the crudeness of reality would make the world unbearable.”

“To make the material speak to man in the name of man, this is the aim and reality of art.”
Statement of 1971; as quoted in Asger Jorn (2002) by Arken Museum of Modern Art, p. 145
1959 - 1973, Various sources

“In reality opposites are one; art shows this.”
Everything Has to Do with Hardness and Softness (1969)

https://www.theguardian.com/film/2009/jun/13/abbas-kiarostami-film

Source: 1970s and later, Themes and Conclusions (1982), p. 188.

“All right. I’m not opposed to reality imitating art if it doesn’t get in the way.”
Source: Lines of Power (1968), p. 26

Discourse no. 12; vol. 2, p. 104.
Discourses on Art