“The apophthegm "Know thyself" is his.”

— Diogenes Laërtius

Thales, 13. Compare" "There are two sentences inscribed upon the Delphic oracle, hugely accommodated to the usages of man’s life: 'Know thyself', and 'Nothing too much'; and upon these all other precepts depend", Plutarch, Consolation to Apollonius.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 1: The Seven Sages

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Diogenes Laërtius 107

biographer of ancient Greek philosophers 180–240

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