What phrase dating back to Ancient Greece had reminded a motto of psychological study?

The phrase "Know thyself" (Greek: "Γνῶθι σαυτόν") dates back to Ancient Greece and is often associated with the Delphic maxims. This motto underscores the importance of self-awareness and introspection, which are key components in psychological study and understanding human behavior. It encourages individuals to examine their own thoughts, feelings, and motivations, fostering personal growth and insight.