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Descartes

 

This statement is definitely true said or thought because it is self-evident. The I stands for an immaterial substance. I cannot doubt that I exist but I can doubt that I have a body. Substances or things have properties which can only exist if they are attached to something. Substances can be either physical or non-physical, and properties are essential or non-essential. The essential property of self, a non-essential substance is self-consciousness. An essential property of a thing is the properties such as if you remove it or them you destroy the thing. So, all Descartes is sure of right now is that he exists, he is not sure if anything in the external world exists.
             Descartes is a strong dualist. He believes a mind can exist without a body but a body can't exist without a mind. What farther helps him in reinforcing his belief is that it is historically respected in the Christian religion that there is an afterlife and a resurrection. When a person goes to heaven the body stays behind and the soul or the mind goes on. Materialism is the belief that the only things that exist and are real are things which have physical properties and bodies. This is a weak theory because if only material things exist then minds do not exist.
             Descartes having proven that he, an immaterial substance exists considers the various ideas he finds within his consciousness and whether or not he could be the cause of them. An idea is any conscious mental state. He finds that he possesses the idea of a perfect being. A perfect being has all perfectible qualities to an infinite extent. The way he goes on proving god exists is that if Descartes, an imperfect being, who makes mistakes, has an idea of a perfect being the being must exist. The way he explains this is ideas are effects, so every idea has a cause, and all events have a cause. The cause of an idea must be at least as real and perfect as what the idea is about.


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