Knowledge according to the Merriam-Webster dictionary is "acts, information, and skills acquired by a person through experience or education". René Descartes saw knowledge achieved through deductive logic and would not agree with this definition. On the other hand, Charles Peirce's pragmatic approach is why we have this definition. René Descartes believed that ridding himself of all prejudices and prejudices and doubting everything, including his senses, body and all his previous experiences, based on a mathematical approach was how humans can learn about the natural world. Rather than going out into the world in search of knowledge, Descartes wants us to think and go deeper within ourselves. He states: “Only after denying all falsehoods arising from the external world can we begin a new logical structure based strictly on defined truths. For our foundations to be firm, we must find a point that is certain and this point is within us." (Design) Descartes wants us to question everything except God, because the knowledge we gain from others is not certain since we did not acquire it ourselves. Descartes argued that we can trust God because God gives us clear and distinct ideas and since God can be trusted, so are these thoughts. Therefore, for this to be true, God must exist. Descartes believes that God exists because he is perfect and if he were not perfect he would not exist. In short, Descartes thought that doubt will move the investigator towards the elimination of error and, consequently, certainty will be given to knowledge. Charles Peirce believed that “only through linguistic, logical, and pragmatic signs considered as instruments and objects can human beings know about the natural world.” (Kremer...... middle of paper ......n for his thinking. Peirce wants his thoughts to make sense on their own, without having to be applicable in all cases. Peirce is concerned with what is practical, not the theoretical, because what is theoretical is not real for Peirce Descartes sought absolute certainty, Peirce considered it impossible, because there are only beliefs we can never know for sure what the truth is, but we can believe that something is true once we stop doubting them today because they don't need foundations to succeed, while an atheist for example would have some problems with Descartes' theories because they are based on the existence of God.