The maxim know thyself was carved at the temple of Apollo at Delphi. Socrates took it to heart: one must know what one is before inquiring into anything else. The Platonic tradition read it as knowing the soul’s divine origin, and contemplative traditions everywhere have their equivalents.
Know thyself
Gnōthi seauton: the maxim inscribed at Delphi, which Socrates made the starting point of philosophy.
Also: gnothi seauton