“The essence of modernism lies in the use of the characteristic methods of a discipline to criticize the discipline itself, not in order to subvert it but in order to entrench it more firmly in its area of competence. Modernism used art to call attention to art. The limitations that constitute the medium of painting - the flat surface, the shape of the support, the properties of the pigment - came to be regarded as positive factors, and were acknowledged openly.”
1960s, Modernist Painting (1960)
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Clement Greenberg 17
American writer and artist 1909–1994Related quotes
Source: Art on the Edge, (1975), p. 71, "Lester Johnson's Abstract Men"

“Art implies discipline; the more excellent the art, the more rigorous the discipline.”
Source: Demon Princes (1964-1981), The Palace of Love (1967), Chapter 7 (p. 356)

Jorn's quote, from his speech at the library of Silkeborg, September l0th 1953 (translated from an unpublished Danish manuscript by Guy Atkins) ; as quoted on the website of the Jorn Museum Articles by Jorn http://www.museumjorn.dk/en/article_presentation.asp?AjrDcmntId=255
1949 - 1958, Various sources
"Tradition-Bound Literature and Traditionless Painting"
The Struggle of the Modern (1963)