Aleister Crowley wrote The Gnostic Mass —Liber XV — in 1913 while travelling in Russia. The structure is similar to the Mass of the Eastern Orthodox Church and Roman Catholic Church, but communicating the principles of Crowley’s Thelema. It is the central rite, both public and private, of the O.T.O. and its ecclesiastical arm, Ecclesia Gnostica Catholica.
The ceremony calls for five officers: a Priest, a Priestess, a Deacon, and two acolytes, called Children (often performed by adults). The end of the ritual culminates in the consummation of the Eucharist, consisting of a goblet of wine and a Cake of Light, after which the congregant proclaims “There is no part of me that is not of the gods!”
For more information, visit the Ecclesia Gnostica Catholica home page: