Hence it comes to pass, that a man, who is very sober, and of right understanding in all other things, may in one particular be as frantic, as any in… - John Locke

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Hence it comes to pass, that a man, who is very sober, and of right understanding in all other things, may in one particular be as frantic, as any in Bedlam; if either by any sudden very strong impression, or long fixing his fancy upon one sort of thoughts, incoherent ideas have been cemented together so powerfully, as to remain united. But there are degrees of madness, as of folly; the disorderly jumbling ideas together, is in some more, and some less. In short, herein seems to lie the difference between idiots and madmen, That madmen put wrong ideas together, and so make wrong propositions, but argue and reason right from them: but idiots make very few or no propositions, and reason scarce at all.