By means of his method of doubt, Descartes shows that there is one thing we can know with certainty-namely, that we cannot know anything with certainty.

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Descartes' method of doubt actually leads to the conclusion that there is one thing we can know with certainty: "I think, therefore I am" (Cogito, ergo sum), indicating the certainty of one's own existence as a thinking being.

By Means of His Method of Doubt, Descartes Shows That