Descartes' argument for Dualism (idea)
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Descartes wanted to believe that the [mind] was something special and separate from the matter that makes up our bodies. After all, if the mind is of the same stuff as the rest of the universe, how can you defend the idea of [free will] from charges of [determinism]? So he came up with some arguments supporting [dualism], the world view that the mind and the body are intrinsically different from each other. Here is his first attempt:
(1) I am not [dubitable] -- See [The method of doubt].
The problem with this argument is that [doubt] is not an [intrinsic property]. It is projected by the [doubter]. Therefor this argument is not [sound].
Next [Descartes] tried replacing dubitable with [divisible]. You can cut off a finger and have 'two parts of your body'. You cannot cut off a piece of your mind and have two parts of your mind. The problem with that is that you can cut off bits of your mind. A [lobotomy], for example, will result in two parts of your mind that do not always work together and may be unaware of what the other is doing. We also may loose part of our mind (the ability to speak, to comprehend, to taste or see, to plan, to remember, etc.), which means that these parts of the mind are indeed divisible. However, this objection was not made apparent to Descartes, so he remained satisfied with the philosophy of dualism. But now you know better!