Why is the Summa Theologiae Important? (Aquinas 101)

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“Three things are necessary for the salvation of man: to know what he ought to believe, to know what he ought to desire, and to know what he ought to do.” -St. Thomas Aquinas

St. Thomas Aquinas’ Summa Theologiae is his most perfect and influential work. The Summa is structured as a movement of going out from and returning to God (called—in Latin—the exitus-reditus schema). So, one begins by considering God in himself, and then the procession of creatures from God, and then their return to him in the moral life through Christ and his sacraments.

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Why is the Summa Important? (Aquinas 101) - Fr. Gregory Pine, O.P.

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Aquinas 101 is a project of the Thomistic Institute that seeks to promote Catholic truth through short, engaging video lessons. You can browse earlier videos at your own pace or enroll in one of our FREE Aquinas 101 courses on St. Thomas Aquinas and his masterwork, the Summa theologiae. In these courses, you'll learn from expert scientists, philosophers, and theologiansincluding Dominican friars from the Province of St. Joseph. Enroll today at And don’t forget to like and share with your friends, because it matters what you think!

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