Summa Theologica
St. Thomas Aquinas
$ 5.99

The Summa Theologiæ (written 1265–1274 and also known as the Summa Theologica or simply the Summa) is the best-known work of Thomas Aquinas (c. 1225–1274). Although unfinished, the Summa is "one of the classics of the history of philosophy and one of the most influential works of Western literature."

It was intended as an instructional guide for theology students, including seminarians and the literate laity. It was a compendium of all of the main theological teachings of the Catholic Church. It presents the reasoning for almost all points of Christian theology in the West. The Summa's topics follow a cycle: the existence of God; Creation, Man; Man's purpose; Christ; the Sacraments; and back to God.

The Summa is Aquinas' "most perfect work, the fruit of his mature years, in which the thought of his whole life is condensed". Among non-scholars, the Summa is perhaps most famous for its five arguments for the existence of God, which are known as the "five ways" (Latin: quinque viae). The five ways, however, occupy under two pages of the Summa's approximately 3,500 pages.

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