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Quotation from An Essay Concerning Human Understanding by John Locke
“For they do not appear to me to have lost the faculty of reasoning, but having joined together some ideas very wrongly, they mistake them for truths; and they err as men do that argue right from wrong principles”
An Essay Concerning Human Understanding, Book II, Ch. XI, §13 (Project Gutenberg #10615)

Locke's theory of madness: the mad reason correctly from false premises produced by violent imagination.
Citation: "For they do not appear to me to have lost the faculty of reasoning, but having joined together some ideas very wrongly, they mistake them for truths; and they err as men do that argue right from wrong principles" — John Locke, An Essay Concerning Human Understanding, Book II, Ch. XI, §13 (Project Gutenberg #10615). (id an-essay-concerning-human-understanding-q4)
Portrait: Portrait of John Locke, Godfrey Kneller, Public domain.
