Know thyself.
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This statement actually predates Socrates, and was used as an Inscription at the Oracle of Delphi. It is a saying traditionally ascribed to one of the "Seven Sages of Greece", notably Solon, but accounts vary as to whom. Socrates himself is reported to have quoted it although it is very likely that Thales was in fact the one who first stated it.Socrates
Socrates
Soddy, Frederick
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