Know thyself

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"Gnothi Seauton" redirects here. For the Terminator: The Sarah Connor Chronicles episode, see Gnothi Seauton (Terminator: The Sarah Connor Chronicles).

A stained glass window with the contracted version γνωθι σαυτόν.

The Ancient Greek aphorism "Know yourself" (Greek: γνῶθι σεαυτόν or gnothi seauton, or σαυτόν with the ε contracted) was inscribed in the pronaos (forecourt) of the Temple of Apollo at Delphi - according to the Greek periegetic (travelogue) writer Pausanias (10.24.1).

The aphorism has been attributed to at least six ancient Greek sages:

Other sources attribute it to Phemonoe, a mythical Greek poetess. In a discussion of moderation and self-awareness, the Roman poet Juvenal quotes the phrase in Greek and states that the precept descended de caelo (from heaven) (Satire 11.27).

The saying "Know thyself" may refer by extension to the ideal of understanding human behavior, morals, and thought, because ultimately to understand oneself is to understand other humans as well. However, the ancient Greek philosophers thought that no man can ever comprehend the human spirit and thought thoroughly, so it would have been almost inconceivable to know oneself fully. Therefore, the saying may refer to a less ambitious ideal, such as knowing one's own habits, morals, temperament, ability to control anger, and other aspects of human behavior that we struggle with on a daily basis.

In Latin, the aphorism is generally given as nosce te ipsum. The Latin version of the aphorism is written on a plaque above the Oracle's door in the Matrix series, where it is rendered in a non-traditional Latin; that is to say temet nosce ("thine own-self you must know") translated in the Matrix as "know thyself".