Summa Theologica

Summa Theologica

Summa theologica, Pars secunda, prima pars. (copy by Peter Schöffer, 1471)
Author	Thomas Aquinas
Translator	Fathers of the English Dominican Province
Subject	Christian Theology
Publisher	Benzinger Brothers Printers to the Holy Apostolic See
Publication date	1485
Media type	Print / online

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.

Throughout the Summa, Aquinas cites Christian, Muslim, Hebrew, and Pagan sources including but not limited to Christian Sacred Scripture, Aristotle, Augustine of Hippo, Avicenna, Averroes, Al-Ghazali, Boethius, John of Damascus, Paul the Apostle, Dionysius the Areopagite, Maimonides, Anselm, Plato, Cicero, and Eriugena.