Racial subconscious, racial memory, or tribal memory, was a psychological theory which posited the existence of certain concepts and ideas which were inherent to a species, such as images representative of good and evil, and those which were considered terrifying. Tribal memories often formed the basis for proverbs. (TNG: "The Naked Now" ) Odo, upon musing that no one taught him his sense of justice, speculated that it constituted a racial memory of his species. (DS9: "Necessary Evil")