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 priestess pegged as the wisest man in the ancient world, discussed the maxim with his pupils Xenophon and Plato, creating the foundation for its modern meaning as an exhortation to be self-aware (versus an admonition to subordinate ourselves to the gods). And today, self-awareness — or metacognition, as psychologists and neuroscientists call it — is just as relevant, especially for leaders.
