Is it not clear too that through self-knowledge men come to much good, and through self-deception to much harm? For those who know themselves, know what things are expedient for themselves and discern their own powers and limitations. And by doing what they understand, they get what they want and prosper: by refraining from attempting what they do not understand, they make no mistakes and avoid failure. And consequently through their power of testing other men too, and through their intercourse with others, they get what is good and shun what is bad.
Memorabilia. Xenophon. Edgar Carew Marchant (Translator). Cambridge, MA. 1923.
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