How Does Descartes Doubt That He Exist

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Descartes most famous phrase is "I think therefore I am." In this sense he doubts that he exists. However, he cannot doubt that he is doubting himself. In a sense, he cannot doubt that he is the thinking thing. He cannot doubt that he exist as a mind, thinking thing, but he can doubt that he has a body. Therefore, the mind is not the same thing as the body. If one can doubt the properties of one but not the properties of another, the two things cannot be the same thing. If one exists and the other does not, they are different. If they are made out of the same substance, they should be made out of the same properties. In this case the property can be existence. Therefore, the mind and the body are not the same thing.
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