Fr. Philip-Neri Reese analyzes Aquinas’s method for dividing and relating the sciences, clarifying the distinction between speculative and practical sciences, the role of material and formal causes, and the concept of mixed or subalternated sciences.

This lecture was given on July 17th, 2025, at Dominican House of Studies.

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About the Speakers:

Fr. Philip-Neri Reese is a Dominican friar of the Province of St Joseph and a Professor of Philosophy at the Pontifical University of St.Thomas (Angelicum) in Rome. He is also the principal investigator for the Angelicum Thomistic Institute’s new Project on Philosophy and the Thomistic Tradition. He received his Licentiate in Philosophy from the Catholic University of America in 2015 and his Doctorate in Philosophy from the University of Notre Dame in 2022. From 2015-2017 he taught philosophy at Providence College in Providence, RI. His main area of research is metaphysics and anything adjacent to it, with a special emphasis on the metaphysical thought of St. Thomas Aquinas and its subsequent reception and interpretation. His publications, however, range widely, including articles on philosophical anthropology, ethics, and economics. He is also an enthusiast of classical Indian philosophy. Fr Philip-Neri is a member of the American Philosophical Association, the Society for Medieval and Renaissance Philosophy, the Aquinas and the Arabs International Working Group, the Society for Medieval and Renaissance Thomism, and is currently serving on the executive committee of the American Catholic Philosophical Association.

Keywords: Aristotelianism, Causality, Formal and Material Division, Intellectual Virtues, Mathematics, Metaphysics, Mixed Sciences, Natural Philosophy, Practical Sciences, Summa Theologiae

Dividing and Relating the Sciences in Aquinas I Fr. Philip-Neri Reese, O.P.

The Thomistic Institute