“For the student of visionary art the interesting fact is that an image comes first and takes up residence in the mind long before the artist has any notion why it is there or what it means. Whether visions come from some great reservoir of symbolic images which are eternally there (and if one examines the recurrence of images in history this proposition is not quite as crazy as it sounds) or whether they are due to buried memories, their obsessive power over an artist's mind, and their clear, compulsive emergence in his work depends on a mental condition that can come and go. When, for some reason, they no longer present themselves to the mind's eye, alive or clamoring to be born, the visionary artist has a hard time — dark days. This is particularly true if he has lost the habit of feeding his mind on the observation of nature.”
Source: The Romantic Rebellion (1973), Ch. 6: Blake
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Kenneth Clark 47
Art historian, broadcaster and museum director 1903–1983Related quotes

“With every artist comes the image he portrays and the picture that he paints”
"One Day at a Time" (featured on Tupac: Resurrection, 2003)
2000s
Source: The Closing of the American Mind (1987), p. 67.
'Perfect Fluency' interview with Scott Rosenberg, University of Wyoming Campus, Oct. 2010.
Other
The Ideas of Art, Tiger's Eye, Vol. 1, nr 2, December 1947, p. 43.
1940s

as quoted by Ilya Prigogine in his Autobiography http://nobelprize.org/nobel_prizes/chemistry/laureates/1977/prigogine-autobio.html given at the occasion of Prigogine's 1977 Nobel Prize in Chemistry.

Quote from Of divers arts, (1962), p. 21; as cited in International Handbook on Giftedness, Larisa V. Shavinina (2009), p. 862
undated

Source: The Courage to Create (1975), Ch. 1 : The Courage to Create, p. 32
Context: Artists are generally soft-spoken persons who are concerned with their inner visions and images. But that is precisely what makes them feared by any coercive society. For they are the bearers of the human being's age old capacity to be insurgent. They love to immerse themselves in chaos in order to put it into form, just as God created form out of chaos in Genesis. Forever unsatisfied with the mundane, the apathetic, the conventional, they always push on to newer worlds.

Source: 1970s, The Awakening of Intelligence (1973), p. 337
Context: How can one be free of the images that one has? First of all, I must find out how these images come into being, what is the mechanism that creates them. You can see that at the moment of actual relationship, that is, when you are talking, when there are arguments, when there are insults and brutality, if you are not completely attentive at that moment, then the mechanism of building an image starts. That is, when the mind is not completely attentive at the moment of action, then the mechanism of building images is set in motion. When you say something to me which I do not like — or which I like — if at that moment I am not completely attentive, then the mechanism starts. If I am attentive, aware, then there is no building of images.