Does God Exist? St. Thomas Aquinas has written several important works. Some of them are: The Disputed Questions on the Power of God, Exposition of Dionysius on the Divine Names and Disputed Questions on Spiritual Creatures. Most of Aquinas's works have been written to try to prove the existence of God. Aquinas has been a firm believer that everything had to have a creator and the only possible solution would be something called God. It is with this idea that Aquinas's Third Way was written. In his De aeternitate mundi contra murmurantes, Aquinas insists that human reason cannot prove the impossibility of an eternally created universe. Once again Aquinas has written with the certainty t