The radical French philosopher Georges Bataille and the English magus Aleister Crowley at first seem to have much in common—both explored the darker sides of eroticism and their links to spiritual experience, both were evocative writers expressing philosophical standpoints considered beyond the pale of polite early twentieth-century society, and both sought a rapturous mystical dissolution of the ego-bound self, a union with what traditional mystics would call the One or the All. But their understandings of the end of the mystic’s quest differ greatly—even to the point that, according to orthodox Thelema’s conception of the magician’s supreme goal of “crossing the Abyss,” Bataille could be labeled a member of the vilified Black Brotherhood, that society of Dark Adepts who ultimately fail in their spiritual task.