"The first step to self-knowledge is to know that thou art composed of an outward shape, called the body, and an inward entity called the heart or soul. By "heart," I do not mean the piece of flesh situated in the left of our bodies, but that which uses all the other faculties as its instruments and servants. In truth, it does not belong to the visible world, but to the invisible, and has come into this world as a traveller visits a foreign country for the sake of merchandise, and will presently return to its native land. It is the knowledge of this entity and its attributes which is the key to the knowledge of God."