To "know thyself" must mean to know the malignancy of one's own instincts and to know, as well, one's power to deflect it.
Karl A. MenningerChess is a more highly symbolic game, but the aggressions are therefore even more frankly represented in the play. It probably began as a war game; that is, the representation of a miniature battle between the forces of two kingdoms
Karl A. Menninger