Paranoia is a form of insanity which, Dr. Randoph told me, hasn’t any physical symptoms. It’s just a delusion supported by a systematic framework of rationalization. A paranoiac can be sane in every way except one.

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Quote text and notes from Wikiquote: Fredric Brown (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.