Know thyself

“Know thyself” is a piece of advice which is as old as civilization, and probably a great deal older. To follow that advice, a man must do more than indulge in introspection. If I would know myself, I must know my environment; for as a body, I am part of the environment, a natural object among other natural objects, and, as a mind, I consist to a great extent of my immediate reactions to the environment and of my secondary reactions to those primary reactions.

~ Aldous Huxley