“We had quarrelled about philosophy and physics. His mind was intensely positive, brutally matter-of-fact, but capable of appreciating subtlety, and far more open to new facts and theories than most of his opponents supposed. His arrogance was, to a great extent, the Freudian protection against his own uncertainty. He knew psychology, he knew men; he understood business; and in his capacity of instructor at Harvard, he had acquired the habit of forming and directing minds. So much I knew, and I pictured my duel with him in romantic terms of Sherlock Holmes and Moriarty.” — Aleister Crowley, Confessions, Chapter 76, writing about his “old enemy” Professor Hugo Münsterberg.