Part 1 of Essay
is known as foundationalism. In his Meditations, Descartes tries to discover certain, indubitable foundations for knowledge. He is searching for absolute certainty, and does this by subjecting everything to doubt. Through this he reaches the one thing he believes to be certain, his existence. In Meditation One, Descarte ....

Part 2 of Essay
.... He exists, at least when he thinks he exists. This view holds that Descartes asserts that he is thinking, he believes that 'whatever thinks must exist' and therefore that he logically concludes that he exists. Furthermore Descartes is convinced that he exists since there is a God deceiving him about his existence which could only be done if he did exist. "But there is a deceiver of supreme power and cunning who is deliberately and constantly deceiving me. In that case I too undoubtedly exist, if he is de ....