Descartes is a rational thinker and he rationalizes through his studies that nothing in the world is known. He decided to re-start his belief process and call everything he has ever believed in, into doubt. He is debating complex ideas in his head, changing his mind and objectively making decisions, so his existence in a world has to be a certainty. The fact that he is having these thoughts, whether right or wrong proves mental capacity. Descartes then states with certainty cogito ergo sum?(I am, I exist). This is the first accurate idea that Descartes knows with any conviction, he knows that he is a thinking being? Descartes still does not know what he is, he says but what then am I? A thing that thinks. What is that? A thing that doubts, understands, affirms, denies, wills, refuses, and that also imagines and senses? He is aware of his mental capacity and knows he thinks, deliberates and makes decisions, but he still rejects his body and his senses. One major flaw found in Descartes' argument is that while critically examining, and then rejecting, mostly everything in the world around him, he maintained that he could prove the existence of G-d, beyond a shadow of a doubt. For thousands of years, people have been trying to prove God existence but he has yet to be successful. It seems to me that Descartes showed a display of arrogance in supposing that he could devise a method of proving the existence of G-d, doing so without a great deal of difficulty. At one point in his discourse on method, Descartes sets out a code of morals, which he plans to abide by. Descartes states that he plans to obey the laws and the customs of my country, constantly holding on to the religion in which, by God's grace, I had been instructed from my childhood. It is quite apparent from this passage, that Descartes had accepted and embraced the idea of G-d long before he even began to question it. With this pre-judgment of G-d's existence, he could not possibly have made a fair and accurate conclusion as to whether or not G-d really exists.