The Summa Contra Gentiles (“On the Truth of the Catholic Faith against the Gentiles”) of St. Thomas Aquinas, written c. 1259–1265: a four-book demonstration of the Catholic faith addressed to those outside it. Books I–III proceed by natural reason; Book IV treats the mysteries known only by revelation.

English translation from the Hanover House edition (1955–57), edited with updated Scriptural references by Joseph Kenny, O.P. Text from isidore.co.

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