Black Magic is Not a Myth in Articles by Aleister Crowley.

“My enemies say that the celebration of the ‘Black Mass’ was one of the most innocuous of my activities in Sicily and in France.” [via, also]

Consider also:

  1. “At this ‘mass,’ always held in some secret place, preferably in a disused chapel, at midnight, the priest appears in canonical robes. But even in his robes there is some sinister change, a perversion of their symbolic sanctity.”
  2. “The priest must be careful, however, to consecrate the Host in the orthodox manner. The wine has been adulterated with magical drugs like deadly nightshade and vervain, but the priest must convert it into the blood of Christ.”
  3. “Foolish people say that I am a Black Magician, that I am in the habit of celebrating the Black Mass and the Witches’ Sabbath, that I eat new-born babes and explore the sky on a broomstick. They say that Satan is my master and that I am his faithful agent.”
  4. “The ‘Black Mass’ is a totally different matter. I could not celebrate it if I wanted to, for I am not a consecrated priest of the Christian Church. The celebrant must be a priest, for the whole idea of the practice is to profane the Sacrament of the Eucharist. Therefore you must believe in the truth of the cult and the efficacy of its ritual.”
  5. “In the congregational form of the Black Mass the priest, having finished his abominations–these are, quite frankly, indescribable–scatters the fragments of the Host on the floor, and the assistants scramble for the soiled fragments, the possession of which, they believe, will allow them to work their petty and malicious designs.”