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In most Muhammedan countries, and certainly in the Egypt which I knew many years ago, lunatics were believed to have left their soul behind in the heaven world, so that their deserted bodies were bereft of the mind's guidance. They, and in particular mentally retarded idiots, were considered to be holy because of this connection with their praying or worshipping souls in heaven.
-- Notebooks Category 15: The Orient > Chapter 6 : Islamic Cultures, Egypt > # 46