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Many of the spirits who influence mediums are evil, diabolic, or malevolent. Others are only mischievous, deceptive, and lying. Some are harmless and a few may even be good. But the risks from the first two types are so large and so dangerous that the practice of mediumship is banned to its students by philosophy.
-- Notebooks Category 16: The Sensitives > Chapter 13 : The Occult > # 141