let us be calm and wise

I have not read the book, and see no reason to myself. One of the flaws is that the OTO has nothing to do with Witchcraft. Gardner was influenced by Crowley, but there is no actual crossover There are people involved in both Witchcraft and Thelema, but more along the lines of people involved in both Witchcraft and Science Fiction fandom. The text of the Gnostic Mass is widely available; the initiations, even the Minerval is most certainly not, and hope someone has told the higher levels of the OTO - they have been known to sue.