1910s
Source: 'Merz Painting' (1919); as quoted in I is Style, ed. Siegfried Gohr & Gunda Luyken, NAI Publishers, Rotterdam 2000, p. 91.
“.. I will endeavour to make clear to men of good will what the word 'material' means with regard to painting and that, without the material substance of paint, a painting is not a work of art but merely a decorative object, or rather, if it deals with an invented painting, the value of the image resides in its spiritual content.
In order to be a work of art, a painting must be very well painted and the good quality of the paint depends completely on the material substance of the paint with which it is executed. This matter, which constitutes the substance of painting, is composed of two elements which are equally important and absolutely inseparable: physical substance and metaphysical substance. These two elements complete each other reciprocally and when they are of a superior quality, create a masterpiece by way of their absolute harmony.”
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
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Giorgio de Chirico 23
Italian artist 1888–1978Related quotes
“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)

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

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

As quoted in "American Modernists in Painting take the Public into their Confidence" in Current Opinion Vol LX, No. 5 (May 1916), p. 351

To Wilfred Watson, October 6 1965. Letters of Marshall McLuhan (1987), p. 325
1960s

Quoted in: 'Karel Appel, Dutch Expressionist Painter, Dies at 85', by Margalit Fox, in 'Art & Design', New York Times May 9, 2006
Quote of an oral history in 'Contemporary Artists' - Karel Appel describes the wild artistic urgency that gave rise to the Cobra artist-group

Quoted in: Paul Jones (2011), The Sociology of Architecture: Constructing Identities. p. 47.
Other explanation by Picasso of the Guernica.
Quotes, 1930's
quote about the role of light
1960s, Interview with Barbara Rose', Archives - American Art, 1968