"Since the days of the unlucky mediaeval philosophers, the last to write upon these secret doctrines of which they were the depositories, few men have dared to brave persecution and prejudice by placing their knowledge upon record. And these few have never, as a rule, written for the public, but only for those of their own and succeeding times who possessed the key to their jargon. The multitude, not understanding them or their doctrines, have been accustomed to regard them. Introduction"