The basic indubitable truth upon which Descartes sought to found all his knowledge was that:
A) he, himself, exists.
B) an all-powerful God exists.
C) mathematical truths cannot be doubted.
D) the facts of experience cannot be doubted.
E) the senses do not lie.

Question

Quizplus · Accepted Answer

Descartes' famous dictum "Cogito, ergo sum" (I think, therefore I am) expresses the basic truth upon which he sought to build his system of knowledge. Descartes considered this truth to be indubitable and self-evident, since even if one doubts everything else, one cannot doubt one's own existence as a thinking being.

The Basic Indubitable Truth Upon Which Descartes Sought to Found