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

Descartes comes to the final conclusion that it is only through your senses and reason that it is possible to come to learn the truth. He does not trust the senses completely because the senses can deceive you very easily, whereas your reason would not deceive you. Descartes emphasizes that we learn everything beginning with “I think therefore I am” because that is what we know best and therefore understand the most clearly and distinctly. Descartes knows that with the most certitude because that is what comes to him most clearly and distinctly, and it is the first step to learning the truth.

Descartes also believes that his views about God and a perfect being are very important to his philosophy. Descartes knows that he does doubt certain things that do not appear clear and distinct, therefore if he doubts, he is not perfect. Since he knows he doubts he also knows that, “…There must be something else more perfect, upon which I depended, and from which I had acquired all that I had.” Because Descartes knows that other beings exist, he knows that it is not possible for everything else to come from him, therefore, there must be a more perfect being that created everything.

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