Freemasonry is a fraternity within a fraternity-an outer organization concealing an inner brotherhood of the elect. Before it is possible to intelligently discuss the origin of the Craft, it is necessary, therefore, to establish the existence of these two separate yet interdependent orders, the one visible and the other invisible. The visible society is a splendid camaraderie of "free and accepted" men enjoined to devote themselves to ethical, educational, fraternal, patriotic, and humanitarian concerns. The invisible society is a secret and most august fraternity whose members are dedicated to the service of a mysterious arcanum arcanorum. Those Brethren who have essayed to write the history of their Craft have not included in their disquisitions the story of that truly secret inner society which is to the body Freemasonic what the heart is to the body human.