“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.
In each generation only a few are accepted into the inner sanctuary of the Work, but these are veritable Princes of the Truth and their sainted names shall be remembered in future ages together with the seers and prophets of the elder world. Though the great initiate-philosophers of Freemasonry can be counted upon one’s fingers, yet their power is not to be measured by the achievements of ordinary men. They are dwellers upon the Threshold of the Innermost, Masters of that secret doctrine which forms the invisible foundation of every great theological and rational institution.“
– Manly P. Hall – Rosicrucian and Masonic Origins