Theopedia

Thomism

Definition

Thomism is the philosophical-theological school built on the writings of the medieval Dominican friar Thomas Aquinas, whose Summa Theologiae represents “the pinnacle of the Roman Catholic scholastic tradition.”1 The school is known chiefly for its proofs for God’s existence from created effects,2 its case for a natural knowledge of God available to reason apart from special revelation,3 and a scheme of grace in which a believer, once justified, can merit further grace and eternal life.4 A Protestant appropriation, “Reformed Thomism,” draws on the school’s doctrine-of-God arguments while rejecting its soteriology.5

Historical Origin

Thomas Aquinas, an Italian Dominican friar born around 1224, became, in the nineteenth-century Reformed judgment of A. A. Hodge, the age’s foremost advocate of “the Augustinian system of theology” among the medieval Schoolmen, arguing it “with consummate ability” though in the “cumbrous and artificial manner which characterized” scholastic argument generally.6 His chief opponent among the Schoolmen was the Franciscan John Duns Scotus, whose rival system Hodge judges “Semipelagian.” The two schools that grew from this disagreement persisted for centuries: “the Dominicans and the Thomists in general” held to unconditional election and efficacious grace, against “the Franciscans and the Scotists,” who held to conditional election and an unaided human power to cooperate with or resist divine grace.6 The Council of Trent, which convened in 1546, attempted a “non-committal Creed that would satisfy the adherents of both systems,” but, in Hodge’s judgment, its detailed canons tilted in the Scotist direction even where its general statements read as Augustinian.6

The same alignment carried into a further controversy after the Reformation. When the Spanish Jesuit Luis de Molina proposed a doctrine of divine “middle knowledge” in 1588 to secure human freedom against a strict account of efficacious grace, his Jesuit followers became known as Molinists, opposed by the Dominicans on Aquinas’s own account of divine causality; “these controversies between the Dominicans and Molinists… have continued even to our own time.”6 Aquinas himself (1225-1274) wrote the Summa Theologiae toward the end of his life; O’Kelley calls it his “most mature and enduring work,” and it became in time the central text of the school that took his name.1

Core Tenets

The Doctrine of God and Proofs for God’s Existence

Among the historic proofs for God’s existence offered by Aristotle, Plotinus, Augustine, and later Leibniz, the “Thomistic proof,” in philosopher Edward Feser’s summary (quoted by Craig Carter), “begins with the real distinction, in each of the things of our experience, between its essence and its existence, and argues that the ultimate cause of such things must be something which is subsistent existence itself.”2 From this doctrine of God, Thomism holds that words applied to both God and creatures, such as “wise” or “good,” are neither univocal (meaning exactly the same in both cases) nor purely equivocal (sharing nothing but the word), but analogical, since “God is more distant from creatures than any creatures are from each other.”7 This grammar of analogy underwrites the school’s wider doctrine of divine simplicity, the teaching that God is not composed of parts and is identical with his own attributes.8

Natural Theology

Thomism holds that the created order itself yields a genuine, though limited, natural knowledge of God apart from special revelation. Steven Duby summarizes the underlying Thomist claim: the active power of the human intellect, “under God’s providence and participating in the divine intellect that contains the eternal types of created things, suffices for understanding those things to which natural reason ‘extends itself,’” though a further, supernatural light is needed to understand what exceeds it.3 This natural knowledge does not by itself save; it establishes only that God exists and must be worshiped, leaving fallen humanity culpable for suppressing what it already knows rather than ignorant of it.9

Grace and Merit

Aquinas’s doctrine of grace, laid out in the Prima Secundae of the Summa Theologiae (Questions 109-114), rests on an unconditional doctrine of predestination (Question 23): God’s love creates the worthiness of those he predestines rather than responding to merit he foresees in them.4 Once a person stands in a state of grace, however, Thomism holds that they can merit further grace and eternal life: “condign” merit, a strict equivalence between a work and its reward, insofar as the work proceeds from the grace of the Holy Spirit, and “congruent” merit, proportionate to human capacity but not strictly equivalent, insofar as the same work proceeds from free choice.10 Grace, on this scheme, does not exclude human merit but grounds it, “the instrumental, yet meritorious, cause of final salvation.”11

Comparison with the Reformed Confessions

No chapter of the 1689 LBCF or its Reformed confessional cousins addresses Thomism by name, since it is a philosophical school rather than a topic the confessions state a position on directly. The comparison instead falls out of the confessions’ own doctrine of God and of good works, where the record is genuinely mixed rather than one of simple rejection.

On the doctrine of God, Reformed scholastics engaged Thomist argumentation directly rather than dismissing it. Francis Turretin, constructing his own account of divine simplicity and analogical predication, cites Aquinas’s text directly (Summa Theologiae I.3.5, I.11.3, and I.14.5), even while, in Richard Muller’s description, moving “away from the large-scale use of philosophical categories and a definition of theological truth and certainty exclusive of the philosophical categories of the day” toward “a more biblically grounded defense of the classical doctrine of God.”12 Duby likewise finds that “many of the early Reformed in fact exhibit a broadly Thomistic conception of natural and supernatural theology and of faith and reason,” Calvin’s own affirmation of a natural “sense of divinity” among them.3

On grace and merit, the confessional tradition diverges sharply from Thomism. The 1689 LBCF denies outright the possibility Thomism’s merit scheme depends on, that believers might do more than God requires of them: “They who in their obedience attain to the greatest height which is possible in this life, are so far from being able to supererogate, and to do more than God requires, as that they fall short of much which in duty they are bound to do,” and, further, “We cannot by our best works merit pardon of sin or eternal life at the hand of God,” since even the best works “are defiled and mixed with so much weakness and imperfection, that they cannot endure the severity of God’s punishment.”13 Herman Bavinck states the same Reformed objection to the related Roman Catholic doctrine of the donum superadditum, the “superadded gift” by which Thomism holds Adam’s original righteousness exceeded his created nature: the doctrine “reintroduces meritorious good works” under the guise of honoring grace, where the Reformed view holds instead that Adam’s original righteousness belonged to human nature itself, not to a separate gift added onto it.14

Variants

Reformed Thomism, as Craig Carter names and defends it, is a Protestant appropriation of Thomism’s doctrine of God rather than a Roman Catholic school. It treats the doctrine of God set out in the first forty-three questions of the Summa Theologiae as “an exemplary expression of the trinitarian classical theism at the heart of classic Nicene orthodoxy,” while affirming the Reformation solas as a needed correction of the medieval tradition’s errors “especially in soteriology, ecclesiology, and sacramental theology.”5 Carter traces this position through the Reformed scholastic Francis Turretin and the Puritan John Owen, and finds it renewed in recent writers including John Webster, Michael Allen, Scott Swain, Richard Muller, Carl Trueman, J. V. Fesko, James Dolezal, and Steven J. Duby.5 Baptists who hold this position affirm it within the 1689 LBCF specifically.5

Related Doctrines

References

  1. Aaron Thomas O’Kelley, “Grace and Merit in Late Medieval Theology,” in “A Historical-Theological Critique of the New Perspective on Paul” (PhD diss., The Southern Baptist Theological Seminary, 2010), 35. ↩ ↩2

  2. Craig A. Carter, “What Is Trinitarian Classical Theism?” in Contemplating God with the Great Tradition: Recovering Trinitarian Classical Theism (Grand Rapids: Baker Academic, 2021), chap. 2, quoting Edward Feser, Five Proofs of the Existence of God. ↩ ↩2

  3. Steven J. Duby, God in Himself: Scripture, Metaphysics, and the Task of Christian Theology, Studies in Christian Doctrine and Scripture (Downers Grove, IL: IVP Academic, 2019), chap. 2, “Preparation for the School of Grace.” ↩ ↩2 ↩3

  4. O’Kelley, “Grace and Merit,” 36. ↩ ↩2

  5. Craig A. Carter, “Prologue: How My Mind Has Changed,” in Contemplating God with the Great Tradition: Recovering Trinitarian Classical Theism (Grand Rapids: Baker Academic, 2021). ↩ ↩2 ↩3 ↩4

  6. Archibald Alexander Hodge, Outlines of Theology (New York: Robert Carter and Brothers, 1879), chap. 6, “A Comparison of Systems.” ↩ ↩2 ↩3 ↩4

  7. Darron Thomas Chapman, “Thomas Aquinas and the Definition of Person in the Summa Theologiae,” in “The Concept of Person in Christian Theology: An Exposition and Defense of a Classical Boethian/Thomistic Definition of Person” (PhD diss., The Southern Baptist Theological Seminary, 2026), 95, quoting Thomas Aquinas, Summa Theologiae, ed. John Mortensen and Enrique Alarcón, trans. Laurence Shapcote (Lander, WY: The Aquinas Institute for the Study of Sacred Doctrine, 2012), I, q. 13, art. 5, s.c. ↩

  8. Chapman, “Thomas Aquinas and the Definition of Person,” 95-96. ↩

  9. Carter, “What Is Trinitarian Classical Theism?,” quoting Francis Turretin: “The question is not whether this knowledge is perfect and saving (for we confess that after the entrance of sin it was so much obscured as to be rendered altogether insufficient for salvation), but only whether any knowledge of God remains in man sufficient to lead him to believe that God exists and must be religiously worshiped.” ↩

  10. O’Kelley, “Grace and Merit,” 42-43. ↩

  11. O’Kelley, “Grace and Merit,” 35. ↩

  12. Alex Charles Tibbott, “Turretin and Classical Theism,” in “De Impassibilitate Et Satisfactione: An Examination of the Methodological Implications of Trinitarian Classical Theism for the Doctrine of the Atonement” (PhD diss., The Southern Baptist Theological Seminary, 2024), 97, quoting Richard A. Muller, Post-Reformation Reformed Dogmatics, 3:119. ↩

  13. The Second London Baptist Confession of Faith (1689), chap. 16, “Of Good Works,” paras. 4-5. ↩

  14. Herman Bavinck, Reformed Dogmatics: Abridged in One Volume, ed. John Bolt (Grand Rapids: Baker Academic, 2011), chap. 11, “The Image of God.” ↩