I nevertheless understood at that second the ancient obsession of the God-fearing for another kind of fear: the thrill of exorcism, the mindless whirl of Dervish possession, and the almost erotic surrender of seance, speaking in tongues, and Zen Gnostic trance. I realized at that instant just how surely the affirmation of demons or the summoning of Satan somehow can affirm the reality of their mystic antithesis -the God of Abraham.