Descartes posited an "evil demon" that could deceive him about everything except
A) what he was presently experiencing.
B) his memories of the past.
C) his mathematical calculations.
D) that he exists.

Question

Quizplus · Accepted Answer

Descartes believed that even if an evil demon was deceiving him, he could not doubt his own existence because the very act of doubting proved that he existed (Cogito Ergo Sum). He also believed that he could trust his mathematical calculations as they followed certain logical principles. However, his senses and memories could be unreliable, making them subject to deception by an evil demon.

Descartes Posited an "Evil Demon" That Could Deceive Him About