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There is a phrase you are as likely to find in a serious philosophy text as you are in the wackiest self-help book: "Know thyself!" The phrase has a serious philosophical pedigree: By Socrates’ time, ...

Twenty-five hundred years ago, someone inscribed Know thyself on a column at the Temple of Apollo in Delphi, where the Pythian priestesses famously uttered their prophecies. Socrates, whom one ...