The Summa Contra Gentiles is not merely the only complete summary of Christian doctrine that St. Thomas has written, but also a creative and even revolutionary work of Christian apologetics composed at the precise moment when Christian thought needed to be intellectually creative in order to master and assimilate the intelligence and wisdom of the Greeks and the Arabs. In the Summa, Aquinas works to save and purify the thought of the Greeks and the Arabs in the higher light of Christian Revelation, confident than all that had been rational in the ancient philosophers and their followers would become more rational within Christianity.This exposition and defense of divine truth has two main parts: the consideration of that truth which faith professes and reason investigates, and the consideration of the truth which faith professes and reason is not competent to investigate. The exposition of truths accessible to natural reason occupies Aquinas in the first three books of the Summa. His method is to bring forward demonstrative and probable arguments, some of which are drawn from the philosophers to convince skeptics. In the fourth book Aquinas appeals to the authority of Sacred Scripture for those divine truths which surpass the capacity of reason.
Thomas Aquinas was an immensely influential philosopher and theologian in the tradition of scholasticism, known as Doctor Angelicus and Doctor Communis.
He was the foremost classical proponent of natural theology, and the father of the Thomistic school of philosophy and theology. His influence on Western thought is considerable, and much of modern philosophy was conceived as a reaction against, or as an agreement with, his ideas, particularly in the areas of ethics, natural law and political theory.
The philosophy of Aquinas has exerted enormous influence on subsequent Christian theology, especially that of the Roman Catholic Church, extending to Western philosophy in general, where he stands as a vehicle and modifier of Aristotelianism, which he fused with the thought of Augustine.
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