"Sacks could write sensitively about religion, including a recent article on the role of the Sabbath in his own life, but in writing about mystical experiences, he typically repaired to his professional lexicon, referring to them as hallucinations – seemingly authentic visual and auditory experiences traceable not to any external reality, but only to the brain itself. Sacks had witnessed in many of his patients the depths of human longing, including a deep hunger for God, but to him they revealed truths only about our own psyches."

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