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Descartes is famed by is familiar notion, "I think therefore I am (Cogito, ergo sum.)." It is a conclusion he has reached in his second meditation after much deliberation on the existence of anything certain. After he discovers his ability to doubt and to understand , he is able to substantiate his necessary existence as a consequence. What we doubt or understand may not ultimately correspond, but we can never be uncertain that we are in the process of thought. This idea is a major component in Descartes proof of the external world. He relies on the existence of a non-deceiving God to ensure that an external world exists after calling it into doubt by the invocation of the dream argument. In this argument, Descartes suggests the possibility that none of our ideas are caused by external objects and therefore, such objects may not exist. He also raises the idea of a demon that may deceive us and allow us to perceive what is not really there.

Although he assures himself of his own existence by his modes of thought, he remains uncertain of the reality of an external world. He doubts whether there is anything of material substance that provokes thought within h


Relying on this sort of natural impulse has led him astray in the past, so what is to keep it from happening all the time. He also calls upon the dream argument in this instance. Ideas come to be in dreams independent of external objects and perhaps this is true of ideas when we are awake. It seems that Descartes finds it necessary to first establish the existence of a non-deceiving God before he can be assured of the existence of anything beyond himself and his mode of thought. He does this by the rationalization that his perception of God is that of a perfect being. In order for a being to be perfect it must exist. Since he himself is an imperfect being, he can not conceive the idea of perfection on his own. Therefore, it must have come from some other faculty that must be perfect, which is God.

It is after his proof of the existence of God that Descartes comes to accept that clear and distinct ideas can be trusted. After this deliberation his process of coming to the existence of an external world seems rather direct. I have the clear perception that material objects exist. Since I have already determined that God is not deceiving me nor my perceptions

Some common words found in the essay are:
, God Descartes, external world, objects exist, existence non-deceiving god, independent else, takes space, dream argument, non-deceiving god, completely independent, material objects, external objects, proof external,

Approximate Word count = 784
Approximate Pages = 3 (250 words per page double spaced)

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