“An artist who theorizes about his work is no longer artist but critic.”
The Temptaion of Harringay (1929)
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H. G. Wells 142
English writer 1866–1946Related quotes

Quotation made in an article published in 1914. Strauss had refused to sign the Manifesto of German artists and intellectuals supporting the German role in the war. Other signatories included Strauss' friends and colleagues, such as Max Reinhardt, Richard Dehmel, Max Liebermann, Engelbert Humperdink and Felix Wiengartner. The original article quoting Strauss was by Richard Specht, and is quoted by Romain Rolland in his diary entry, found on page 160 of Richard Strauss and Romain Rolland, edited by Rollo Myers, Calder and boyars, London, 1989.
Other sources

p 97.
So I think, so I paint (1947)
“An Unread Book”, p. 20
The Third Book of Criticism (1969)

“These critics with the illusions they've created about artists — it's like idol worship.”
Associated Press via The Huffington Post http://www.huffingtonpost.com/2010/12/08/lost-john-lennon-interview-30-years-after-death_n_793700.html
Rolling Stone interview (1980)
Context: These critics with the illusions they've created about artists — it's like idol worship. They only like people when they're on their way up … I cannot be on the way up again. … What they want is dead heroes, like Sid Vicious and James Dean. I'm not interesting in being a dead (expletive) hero. … So forget 'em, forget 'em.

Popolo d'Italia (14 July 1920) "The Artificer and the Material," quoted in Mussolini in the Making (1938) by Gaudens Megaro, p. 326
1920s

This quote was actually composed by Louis Nizer, and published in his book, Between You and Me (1948).
Misattributed
Variant: He who works with his hands is a laborer. He who works with his hands and his head is a craftsman. He who works with his hands and his head and his heart is an artist.