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

“The dreadful basis of the Mass is that the bread and wine have imprisoned the Deity. Then they are subjected to terrible profanations.” [via, also]

Consider also:

  1. “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.”
  2. “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.”
  3. “The ceremony is a parody of the orthodox Mass, with blasphemous interpolations.”
  4. “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.”
  5. “There are many ways of abusing the Sacrament. One of the best known of which is the ‘Mass of Saint Secaire,’ the purpose of which is to cause an enemy to wither away.”