(wild guess du jour.... also S.W.A.G. 'scientific wild assed guess' ---) Look to the outlawing of Zoroastrianism under Rome, and you have a religion which shares many trappings with the masonic rituals suddenly outlawed and going underground. The outlawing of the religion had a significant negative impact on the moral of the legions as many of the legionnaires were Zoroastrians. Anything done underground then becomes conspiracy. And, once done in secrecy, then secrecy it's self becomes part of the ritual.