This indefeasibility requirement implies more than mere stability. Awould-be knower could achieve stability simply by never reflecting onreasons for doubt. But this would result in mere undoubtedness,not indubitability. Referring to such a person, Descartes points outthat although a reason for “doubt may not occur to him, it canstill crop up if someone else raises the point or if he looks into thematter himself” (Replies 2, AT 7:141).


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