Gallery Notes, Allbright-Knox Art Gallery, Vol. 24 summer 1961 pp. 9-14; as quoted in Abstract Expressionism Creators and Critics, edited by Clifford Ross, Abrams Publishers New York 1990, p. 197
1960s
“If I am lucky, the picture will paint itself”
Quoted in Insights by Liz rideal, National Portrait Gallery, London 2005 ISBN 1855143631
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Related quotes

Interview with Reuters, quoted on ITN. http://www.itnsource.com/shotlist/RTV/2012/01/26/RTV249512/ (26 January 2012).
As an Artist

"The Painter in the Press", X magazine, Vol. I, No.4 (October 1960).
Context: The Art of painting is itself an intensely personal activity… a picture is a unique and private event in the life of the painter: an object made alone with a man and a blank canvas... A real painting is something which happens to the painter once in a given minute; it is unique in that it will never happen again and in this sense is an impossible object... And it is something which happens in life not in art: a picture which was merely the product of art would not be very interesting and could tell us nothing we were not already aware of. The old saying, “what you don’t know can’t hurt you”, expresses the opposite idea to that which animates the painter before his canvas. It is precisely what he does not know which may destroy him.

In a letter to his sister at the end of his life; as quoted in 'The return of the Native' by Joseph Phelan, Artcyclopedia online
1931 - 1943

Source: 1961 - 1980, transcript of a public forum at Boston university', conducted by Joseph Ablow 1966, pp. 73-75

“A painter paints his pictures on canvas. But musicians paint their pictures on silence.”
Addressing an audience at Carnegie Hall, as quoted in The New York Times (11 May 1967); often this is quoted without the humorous final sentence.
Context: A painter paints his pictures on canvas. But musicians paint their pictures on silence. We provide the music, and you provide the silence.

1950's
Source: Interiors, Vol. 110, no 10, May 1951; as quoted in Abstract Expressionism Creators and Critics, ed. Clifford Ross, Abrams Publishers New York 1990, p. 172

Man Ray to Ferdinand Howard, April 5, 1922, as quoted in Conversion to Modernism: The Early Work of Man Ray (2003) by Francis M. Naumann

Source: after 2000, Doubt and belief in painting' (2003), p. 43, note 36 : quote on his start with photography