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A man demonstrates his rationality, not by a commitment to fixed ideas, stereotyped procedures, or immutable concepts, but by the manner in which, and the occasions on which, he changes those ideas, procedures, and concepts.

— Stephen Toulmin Human Understanding (1972)

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Mind

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Attribution

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