No one desires to injure himself, hence all evil is done unwittingly. The evil man inflicts injury on himself
 Friedrich Nietzsche, Beyond Good and Evil (1886). copy citation

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Author Friedrich Nietzsche
Source Beyond Good and Evil
Topic evil desire
Date 1886
Language English
Reference
Note Translated by Helen Zimmern
Weblink http://www.gutenberg.org/files/4363/4363-h/4363-h.htm

Context

“There is something in the morality of Plato which does not really belong to Plato, but which only appears in his philosophy, one might say, in spite of him: namely, Socratism, for which he himself was too noble. "No one desires to injure himself, hence all evil is done unwittingly. The evil man inflicts injury on himself; he would not do so, however, if he knew that evil is evil. The evil man, therefore, is only evil through error; if one free him from error one will necessarily make him—good."—This mode of reasoning savours of the POPULACE, who perceive only the unpleasant consequences of evil-doing, and practically judge that "it is STUPID to do wrong";” source