philosopy: descartes
...nd all intellection. As a result, skepticism is removed and valid knowledge possible. Descartes primary purpose was the defense of human knowledge against the attacks of the skeptics. He was justified in excluding preconceived notions, presuppositions, and traditions in determining the limits of knowledge. Descartes discarded the ability of the mind to know truth and the human abilities of contradiction and sufficient reason. In doing so, he made a solution to the problem impossible. As it relates to his theory of the existence of God, Descartes universal doubt refutes his own conclusion as to God's existence. Descartes formed an idea of God as an infinitely good being. He would have had to discover this idea within his own mind. According to his principle of universal doubt, he cannot simply know whether his conception of God is correct or incorrect. He would have, as a matter of his own principle, considered it as false until proven otherwise. Therefore, since the idea of God is in doubt, the trustworthiness of man's reasoning must also be doubtful and Descartes cannot escape his own real doubt. Descartes uses a process of reasoning, a mathematical formulae, in attempting to demonstrate God's existence. If his reasoning is of demonstrably doubtful validity, how can Descartes demonstrate God's existence? The validity of Descartes reasoning is supposed to flow as a consequence of the infinite perfection of God; and God's infinite perfect is made certain through Descartes' reasoning powers before he has even proven that these reasoning powers are valid and trustworthy. Descartes assumes the very thing beforehand, which he intends to prove afterwards. Descartes accepts the trustworthiness of his faculties in demonstrating the existence and infinite perfection of God, and that is illegitimate. A doubtfully valid faculty will produce a doubtfully valid argument, which will, in turn, produce a doubtfully valid conclusion. The entire argument for God's existence is therefore nullified by a suspect reasoning process. Since he proves the reliability of his reason and process by means of God's veracity, the proof of his reliability cannot be established beyond doubt. Thus, Descartes attempt to vindicate the validity of human knowledge failed, because, by rejecting the reliability of his own powers to discover and know truth, he made it impossible for himself to remove himself from his own universal doubt. Further, Descartes has marked inconsistencies in the manner in which he applies his procedure. He purports to reject everything in his pursuit of fundamental knowledge, even principles of contradiction and sufficient reason. In reality, he does not. He assumes the truth of these principles and uses them repeatedly. Cogito ergo sum is based upon the validity of the principle of contradiction. This principle states that it is impossible for something to be and not be at the same time. Descartes becomes aware of his own existence by thinking or doubting. Why? Because he perceives that it is impossible to think and not think and to exist and not exist at the same time. If he were consistent and seriously doubted the principle of contradiction, he would have to agree that it is possible for an entity to think and not think, to exist and not exist at the same time. Then, according to his own supposition, he could not be sure after all that the fact of his existence is certain. Only by granting the validity and truth of the principle of contradiction beforehand, can his existence be established as an objective fact. That is exactly what he does. The same line of reasoning applies to his proof of God's existence and infinite perfection. Descartes rejection of the principle of contradiction invalidates his arguments because, as long as this principle is not established and accepted, he could never be sure whether it would be possible for God to exist and not exist at the same time. Similarly, Descartes would have to remain doubtful as to whether God could be veracious and not veracious, deceiving and not deceiving unless the principl...