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Mysticism: A Study of its Nature, Cognitive Value, and Moral Implications by William J. Wainwright (1981)
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In this work, William J. Wainwright, Distinguished Professor Emeritus in Philosophy at the University of Wisconsin Milwaukee, provides a thoughtful and comprehensive study of mysticism.
Topics covered in the book include: the nature of mystical experience, including a suggested typology; chemical mysticism and the scientific study of mystical experience; the cognitive status of mystical experience; some theories on mysticism; and mysticism and morality.
You can read Mysticism: A Study of its Nature, Cognitive Value, and Moral Implications for free at The Internet Archive, a nonprofit digital library founded in 1996 and based in California.