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Defining Terms: Personhood (Aquinas 101)

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May 4, 2026

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According to the ancient philosopher Boethius, a person is an individual substance of a rational nature. What is meant by the word “substance?” And what does it mean to have a rational nature? In this video, Fr. James Brent, O.P., breaks down Boethius’ definition of a person using St. Thomas Aquinas as a guide.

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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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Guests & Subjects Covered

Defining TermsFr James Brent OPSt Thomas AquinasFREE AquinasThomistic InstituteSOCIAL MEDIASt Joseph Enroll

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Defining Terms: Personhood (Aquinas 101) · The Thomistic Institute · Sentinel