Aquinas on Faith & Reason
Aquinas ’s Summa contra gentiles , written to combat Greco- Arabic philosophy , is the greatest apologetic work of the Middle Ages and so merits our attention. Thomas develops a framework for the relationship of faith and reason that includes the Augustinian signs of credibility. He begins by making a distinction within truths about God. On the one hand, there are truths that completely surpass the capability of human reason, for example, the doctrine of the Trinity . On the other hand, many truths lie within the grasp of human reason, such as the existence of God. In the first three volumes of the Summa contra gentiles, Thomas attempts to prove these truths of reason, including the existence and nature of God , the orders of creation, the nature and end of man, and so forth. But when he comes to the fourth volume, in which he handles subjects like the Trinity, the incarnation, the sacraments, and the last things, he suddenly changes his method of approach. He states that t...