Quote from  "The Awe-Struck Witness" in TIME magazine (28 October 1974) http://www.time.com/time/magazine/article/0,9171,908926-1,00.html and in "On the Brink: The Artist and the Seas" by Eldon N. Van Liere in Poetics of the Elements in the Human Condition: The Sea (1985) ed. Anna-Teresa Tymieniecka
Variant translations:
The artist should not only paint what he sees before him, but also what he sees within him. If, however, he sees nothing within him, then he should also omit to paint that which he sees before him.
As quoted in German Romantic Painting (1994) by William Vaughan, p. 68 
undated 
Context: The artist should not only paint what he sees before him, but also what he sees in himself. If, however, he sees nothing within him, then he should also refrain from painting what he sees before him. Otherwise his pictures will be like those folding screens behind which one expects to find only the sick or the dead.
                                    
“It is harder to see than it is to express. The whole value of art rests in the artist's ability to see well into what is before him.”
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Robert Henri 20
American painter 1865–1929Related quotes
The Usurpation Of Language (1910)
                                        
                                        1910 - 1915 
Source: On the Spiritual in Art, 1911; as quoted in Schönberg and Kandinsky: An Historic Encounter, by Klaus Kropfinger; edited by Konrad Boehmer; published by Routledge (imprint of Taylor & Francis, an informal company), 2003, p. 15
                                    
                                        
                                        Global Ideas from Pluto's Challenger (May 21, 2009) 
Context: Creativity is seeing what everyone else sees, but then thinking a new thought that has never been thought before and expressing it somehow. It could be with art, a sculpture, music or even in science. The difference, however, between scientific creativity and any other kind of creativity, is that no matter how long you wait, no one else will ever compose "Beethoven's Ninth Symphony" except for Beethoven. No matter what you do, no one else will paint Van Gogh's "Starry Night." Only Van Gogh could do that because it came from his creativity.Whereas in science, you can't just make stuff up and presume that it is a proper account of nature. At the end of the day, you have to answer to nature. Since everyone has nature to answer to, your creativity is simply discovering something about the natural world that somebody else would have eventually discovered exactly the same way. They might have come through a different path, but they would have landed in the same place.Even though we name theorems and equations after the people who discover them — Newton's laws of gravity, Kepler's laws of planetary motion — somebody else would have discovered them afterward. It's that simple. Your creativity is not a boundless creativity.
                                    
                                        
                                        John F. Kennedy, address at the dedication of the Robert Frost Library, Amherst College, Amherst, Massachusetts (1963-10-26). 
Misattributed
                                    
“Being an artist means seeing things and never having the ability to shut your eyes.”
Associated Press (2008); from an interview conducted by John Rogers.