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The classical way of thinking was that what we know first, and best is what we perceive with our senses. Rene Descartes was a revolutionary philosopher because he went against the classical Aristotelian way of thinking. Descartes stated, that what we know through the senses is more doubtful then what we perceive through our own reason. Therefore what we know first, we know with the greatest certitude, because he does not want to believe anything else that he has learned in the past, and wants to believe what he discovers for himself. He also said that anything that we can doubt, we should not take to be true because our senses can deceive us. Descartes goes against all other ways of thinking, and believes that what we know through reason and what we learn first is what we know with the most certainty. The order in which we know things, according to Descartes, all stems out from his base philosophy, which is “I think therefore I am.” “I think therefore I am” is the basis of Descartes’s philosophy. Because “I think therefore I am” is the first thing that Descartes bases his philosophy on, and it is what he knows the greatest. Since it is the first thing that he learned, it is also the thing that he know