René Descartes Once upon a time we were told that the earth was the center of the universe. The sun, the moon and all the planets, even unknown ones, revolved around our planet. We now look at this statement and wonder in amazement how our species could have thought such a thought. Through advanced mathematics and persistent work to prove his theory, René Descartes transformed yet another one of these worldly assumptions and proved it all wrong. René Descartes' method of doubt was simply his mathematical method for discovering unanswered questions about the universe. He wanted to prove all unknown questions and be sure that he could prove his truths with knowledge provided only by mathematical proofs. “Common sense,” which Descartes calls natural reason, is the understanding of all humans with many given subjects. He believes that in some areas of common sense one should simply be expected to know what all humans are supposed to know and therefore there is no need to prove it mathematically. Faced with René Descartes' extreme doubt, he discovered that he hoped to use skepticism to find complete certainty. When he doubts something, Descartes would start by asking himself if it is rationally possible to doubt everything. By doing so, he will discover whether there is an indisputable truth. Instead of Descartes trying to examine each of his beliefs, he examines the origins of different types of beliefs. In doing so, he rejects any idea that might be wrong, and will reject it outright. The importance of René Descartes' view of philosophy lies in the simple fact that he was entirely proof-oriented. He needed proof to believe in something, and proof was found through truth that is acquired in knowledge. His knowledge was thus acquired mathematically. Its importance was not only in proving ideas through mathematics, but also in proving the existence of God. He tried to build a reliable basis for knowledge with the idea of ​​God. As Descartes said: “If God were all-knowing, all-good and all-powerful, he would not let us live in constant ignorance.” He inspires other individuals to find the truth, even if they believe that the basis for this discovery is impossible. Descartes uses methodical doubt as a form of eliminating all obstacles related to ideas that might even be remotely false..