Teheuti
Abrac - great material. Thank you. I've always made the point that the M stands for Mystery - Mysterium. Mercurio just doesn't seem to fit on the Grail cup but Mysterium serves both the Grail and alchemy.The maxim which might be written over the temples of the official churches is 'Corporis Mysterium'--that the mystery of the body might lead them more fully into the higher mystery of the soul.
And in fine the maxim which might and would be inscribed over the one Temple of the truly Catholic Religion when the faiths of this western world have been united in the higher consciousness--that is assuredly 'Mysterium Fidei'--the mystery which endures for ever and for ever passes into experience."
Given Waite's position concerning Alchemy, might "M" stand for Mercurio?
Mystery is sometimes considered the lost word of Freemasonry: Hic est enim caix sanguinis mei, novi et aeterni testamenti: mysterium fidei, qui pro vobis et pro multis effendetur in remissionum peccatorum. ("For this is the chalice of my blood, of the new and eternal testament: the mystery of faith, which for you and for many shall be shad(?) unto the remission of sins."
It could also stand for Mem (water) and the first letter of the name of the Blessed Virgin Mary (Mari = bitter sea or ocean).
ADDED: Abrac, I just saw that you mention Mystery in the preceeding post. Yes, definitely!