The first duty of a man is the seeking after and the investigation of truth.

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Notes from Wikiquote

Compare: "The distinguishing property of man is to search for and to follow after truth." – De Officiis, Book I, 13

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Attribution

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