I Make Myself Invisible in Articles by Aleister Crowley.

“Some of these rites were often attended with strange results. On several occasions we saw and felt a stranger among us, but when the lights were turned higher there was no one there.

Our ceremonies had caused a being to take human form and be seen among us.” [via, also], [see]

Consider also:

  1. I’ve used PKD for years!
  2. Enthusiasm and Divine Madness
  3. “I then went to Egypt, and–to my intense surprise–was summoned by the secret chiefs of the Order. I was commanded to return to England, there to reconstruct the system of organisation, as the outer form of the Order had broken up through the fall of its chief ambassador to the world ‘without the Veil,’ and to put the secrets in writing.”
  4. “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.”
  5. “Let me say here that it is impossible for a magician to be a man of bad character. He cares nothing for conventions, but he needs the sternest virtues. His powers are limited by himself.”