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In Descartes Third Meditation, he tries desperately to prove that god exists; he does so by clearing all thoughts because they potentially could be false. He uses the fact that God thinks in order to prove his existence. In the third meditation he presents two arguments for the proof of his existence. I believe that these arguments contain many flaws. In the third mediation, Descartes moves forward in the establishment of the idea of certainty. He decides that the truths he earlier discovered in meditation two have a common element of being distinct and clear. He then states, “I now seem able to posit as a general rule that everything I very clearly and distinctly perceived is true (Descartes 19)." He now realizes that things he previously believed to be evident are now doubtful. He saw the earth, stars, and sky as clear and distinct. Although he believed these things were clear because of his senses, they were really just ideas of things. He was assuming without the use of reason. In reality, things in the world caused these ideas.
The third meditation begins with a look at previous meditations where the logic will be necessary for understanding the new meditation. On page 24, he reiterates that god is “a thing that thinks…and is ignorant of many things (Descartes).” These senses that god feels, similarly to human senses, are deceptive and may be false therefore they can not be relied on. Therefore he would like to look into removing all reasons for doubt in order to know if there is a God. This is the point where Descartes ideas are no longer concrete, and there emerges a great deal of room for debate.
When it comes to his proof for God’s existence, he begins with the idea of cause and effect. He believes that everyone in th...

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... God’s existence and removed other possible causes of existence.
It is clear that this argument is not satisfying in proving God’s existence. His logic shows an abundance of flaws. His reasoning for the fact that he has always existed seems concrete at first, but it actually just gives more proof against his existence. What is sustaining God? Descartes does not address this issue but it would be crucial for proving his being. Finally, the idea that he couldn't have come from something less than perfect is also an arguable point to say the least.
Although the reasoning Descartes presents to prove God exists seems to be convincing and is a very solid argument, there are a number of flaws. The arguments leave a great deal of room for disagreement. He provides many examples, but fails to provide solid evidence that is meaningful and understandable to his audience.

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