Descartes’ explore for certainty started out with doubts. He professed that as he had admitted many false opinions as true, his knowledge is dubitable; hence his beliefs are based on unsettled assumptions. Thus, he decided to reconstruct his views upon sound principles. Descartes wisely undermined the foundations of his understandings so that the rest of his thoughts would collapse consequently. To do so, he tackled the validity of senses-acquired knowledge. He also considered the possibility of being deceived, not only about the testimony of the senses, but also about the truth of arithmetical axioms and logical principles (Descartes, 2008, p. 14).