“Leonardo da Vinci wrote in his Notebooks: “It should not be hard for you to stop sometimes and look into the stains of walls, or ashes of a fire, or clouds, or mud or like places in which … you may find really marvelous ideas.”

http://www.popmonk.com/actors/leonardo-dicaprio/quotes-leonardo-dicaprio.htm

Quote from Entretiens avec Salvador Dali, Alain Bosquet, 1966; as cited in The shameful life of Salvador Dali, Ian Gibson, New York / London, Norton & Co, 1997
Quotes of Salvador Dali, 1961 - 1970

Tàpies is referring to the Franco-repression in Spain.
1945 - 1970, A Report on the Wall' 1970

Iraq? They just need to think it through (2007)
Context: What happened was, 2,400 years ago, the Greek Gang of Three, by whom I mean Aristotle, Plato and Socrates, started to think based on analysis, judgment and knowledge. At the same time, church people, who ran the schools and universities, wanted logic to prove the heretics wrong. As a result, design and perceptual thinking was never developed. People assumed philosophers were doing it and so they blocked anyone else from doing it. But philosophers were not. Philosophers may look out at the world from a stained-glass window, but after a while they stop looking at the world and start looking at the stained glass.

Source: Watership Down

Quote of Dubuffet, in a letter to Jacques Berne mailed from Algeria, late 1940's; (Lettres à J.B., p. 35.); as cited in 'Dubuffet, Lévi-Strauss, and the Idea of Art Brut', Kent Minturn http://www.columbia.edu/cu/arthistory/faculty/Minturn/Dubuffet-Levi-Strauss.pdf, from RES: Anthropology and Aesthetics, No. 46, Polemical Objects (Autumn, 2004), pp. 247-258, p. 250
1940's

Source: Will Grayson, Will Grayson

Source: Death Bringer