“But why don’t those who possess this learning communicate it to all the people of God?” “Because not all the people of God are ready to accept so many secrets, and it has often happened that the possessors of this learning have been mistaken for necromancers in league with the Devil, and they have paid with their lives for their wish to share with others their store of knowledge. I myself, during trials in which someone was suspected of dealings with the Devil, have had to take care not to use these lenses, resorting to eager secretaries who would read to me the writings I required.
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