“The worst evil which can befall the artist is that his work should appear good in his own eyes.”
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

"Inversion"
Degrees: Thought Capsules and Micro Tales (1989)

Attributed to Rodin in: Southwestern Art Vol. 6 (1977). p. 20; Partly cited in: A Toolbox for Humanity: More Than 9000 Years of Thought (2004) by Lloyd Albert Johnson, p. 7
1930s and later
Cited in: Dr Ronald Blythe (2013) The Time by the Sea: Aldeburgh 1955-1958. Chapter 5.

“294. A man's discontent is his worst evill.”
Jacula Prudentum (1651)
“The best men are not consistent in good—why should the worst men be consistent in evil?”
Source: The Woman in White