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13. Knowledge Criteria / D. Scepticism / 1. Scepticism

1545	Protagoras was the first to claim that there are two contradictory arguments about everything [Protagoras, by Diog. Laertius]
	Full Idea: Protagoras was the first to claim that there are two contradictory arguments about everything.
	From: report of Protagoras (fragments/reports [c.441 BCE], A01) by Diogenes Laertius - Lives of Eminent Philosophers 09.51