The controversial argument involving the existence of God has been the pinnacle of an endless discourse around the concept of religion in the field of philosophy. However, two arguments proclaim themselves to be the “best” way to justify the existence of God: the Cosmological Argument and the Mystical Argument. Although both arguments attempt to impose a rigorous modus operandi of established reasoning, neither proves to be a better way to explain the existence of God. The downfall of both of these arguments is based on the making of mistakes and the lack of sufficient evidence, which consequently sabotage their validity in the field of philosophy and faith. First, the cosmological argument was developed by St. Thomas Aquinas in 1274 through his work entitled Summa Theologica (otherwise known as the Five Ways). His aim was to demonstrate the existence of God through sensory perception. In part one, article three of the Prima Pars, Aquinas states that to argue, one must become involved in the opposing argument, then subsequently argue one's point of view. In this case, one must consider both the argument for the existence of God (Theism) and the non-existence of God (Atheism) to truly understand the argument they are making for or against. The cosmological argument is divided into three parts, each containing several sub-arguments: In the first part, Thomas Aquinas states that the existence of God is not self-evident, in the sense that reason alone without appealing to faith can provide a good set of reasons to believe. To support this claim, Aquinas refers to “The Argument from Motion”, proposing that:1) Some things are in motion (an 'a. posteriori' claim)2) Whatever moves is moved by a 'other [because nothing can be or should be moved (page 128)]3) ...... middle of the sheet ......or.org/discover/10.2307/40021208?uid=3739448&uid=2129&uid=2&uid =70&uid=3737720&uid=4&sid =21103070119093>6- Kemerling, Garth. "Berkeley's Immaterialism." Berkeley's immaterialism. Np, November 12, 2011. Web. November 28, 2013. .7- Downing, Lisa,. "George Berkeley." Stanford Encyclopedia of Philosophy. Stanford University, September 10, 2004. Web. November 28, 2013. .8- McDermid, Douglas. "The existence of God". PHIL 1000H-B Lecture 9. Trent University, Peterborough. November 21, 2013. Lesson 9- Bennett, Jonathan. "Berkeley and God." Cambridge University Press: Royal Institute of Philosophy: Philosophy 40.153 (1965): 207-21. Print.10- "Definition of Neoplatonism in English". Neoplatonism. Oxford Dictionaries, 2013. Web. 29 November. 2013. .