Quote from an interview in 'The Post', 1972; as cited in 'Helen Frankenthaler, noted abstract painter, dies at 83' https://www.washingtonpost.com/local/obituaries/helen-frankenthaler-noted-abstract-painter-dies-at-83/2011/12/27/gIQAwr0dLP_story.html?noredirect=on&utm_term=.08d9ecdb8773, Matt Schudel, December 27, 2011
1970s - 1980s
“Pop Art is not painting because painting must have content and emotion.”
As quoted in "Grace Hartigan, 86, Abstract Painter, Dies" in The New York Times (18 November 2008)
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Grace Hartigan 4
American artist 1922–2008Related quotes

it's just the idea of imitating the beer can that is important.
Quote from 'Some late thoughts of Marcel Duchamp', an interview with Jeanne Siegel, p. 21; as quoted in 'The New York school – the painters & sculptors of the fifties' Irving Sandler, Harper & Row, Publishers, 1978, p. 194
posthumous

Source: 1960's, What is Pop Art? Interviews with eight painters' (1963), pp. 25-27

Joseph Kosuth in: Arthur R. Rose, “Four Interviews,” Arts Magazine (February, 1969).

Source: 1960's, What is Pop Art? Interviews with eight painters' (1963), pp. 25-27

As quoted in The Quotable Artist (2002) by Peggy Hadden, p. 71.
As quoted in The Quotable Artist (2002) by Peggy Hadden, p. 72.
undated quotes
Variant: They who are compelled to paint by force, without being in the necessary mood, can produce only ungainly works, because this profession requires an unruffled temper.

Quote from De Cirico's text 'A DISCOURSE ON THE MATERIAL SUBSTANCE OF PAINT', 1942 http://www.fondazionedechirico.org/wp-content/uploads/541-547Metafisica5_6.pdf, p. 542
1920s and later

Source: 1960's, What is Pop Art? Interviews with eight painters' (1963), pp. 25-27

“The form of my painting is the content.”
as quoted in "Abstract Art", Anna Moszynska, Thames and Hudson 1990, p. 173
1969 - 1980