Descartes says that because it is possible that an evil genius is deceiving him, he can never be sure of anything, including his own existence.

Name: Descartes says that because it is possible that an evil genius is deceiving him, he can never be sure of anything, including his own existence.
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Descartes actually concludes that the one thing he can be certain of is his own existence, famously stating "Cogito, ergo sum" ("I think, therefore I am") even in the face of deception by an evil genius.

Descartes Says That Because It Is Possible That an Evil