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In addition to my work in the areas of sacred liturgy, sacred music, and Catholic social teaching, I maintain a lively interest in the life, writings, and perennial wisdom of St. Thomas Aquinas, and contribute to the contemporary Thomistic revival through scholarly publications, editing and annotating original texts, and reprinting classics. (For reprints, see the OS JUSTI PRESS page.) Beyond this academic sphere, I also frequently write on topics of current controversy.

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The Ecstasy of Love in the Thought of Thomas Aquinas

My thesis in this book is that Aquinas's rich, unique, and multifaceted teaching on the ecstasy of love ("extasis amoris") is a crucial element in his philosophical account of friendship, his theological presentation of charity, his solution to the so-called "problem of love" (the compatibility of the seemingly self-centered desire for one's own happiness with the requirement to love God for His own sake and to love other created persons as ends, not as means), and his ascetical-mystical doctrine of progress in the spiritual life. The Ecstasy of Love in the Thought of Thomas Aquinas closely examines passages in the Sentences commentary, the Divine Names commentary, the Summa theologiae, and a number of opuscula, with a generous use of the Scripture commentaries. Aquinas is brought into dialogue with ancient, medieval, and modern authors, among them Plato, Aristotle, Plotinus, Augustine, Bernard, Albert, Bonaventure, Bergson, Heidegger, and Marcel. Quotations are given in Latin with fresh English translations. Steubenville, OH: Emmaus Academic Press, 2021.

Commentary on Book IV of the Sentences of Peter Lombard

Distinctions 1–13; Distinctions 14–25; Distinctions 26–42. [An annotated translation St. Thomas Aquinas' early work, Scriptum Super IV Sententiarum, done by a team of scholars of The Aquinas Institute.] Lander, WY: The Aquinas Institute, 2017.

On Love and Charity: Readings from the Commentary on the Sentences of Peter Lombard

[A translation of texts from St. Thomas Aquinas’s Commentary on the Sentences, containing Book I, Distinction 17, in both the Parisian and the Roman versions; Book III, Distinctions 27 to 32; and selected articles from all four Books.] Washington, DC: The Catholic University of America Press, 2008.

Wisdom’s Apprentice: Thomistic Essays in Honor of Lawrence Dewan , O.P.

Edited and introduced by Peter A. Kwasniewski. [A Festschrift of twelve essays with biography and bibliography of the honoree.] Washington, DC: The Catholic University of America Press, 2007.

Academic Articles


  • “Divine Wisdom, Natural Order, and Human Intervention: Leibniz on the Intersection of Theology, Teleology, and Technology.” Studia Neoaristotelica 14/2 (2017): 115–38. [PDF]


  • “St. Thomas on the Grandeur and Limitations of Marriage.” Nova et Vetera 10 (2012): 415–36. [PDF]

  • “On the Ideal Basis and Fruition of Marriage.” Second Spring 12 (2010): 43–53. [PDF]

  • “Aquinas on Eucharistic Ecstasy: From Self-Alienation to Gift of Self.” Nova et Vetera 6 (2008): 157–204. [PDF]

  • “A Thomistic Preface to Theology, ‘The Science of God and of the Blessed.’” Doctor Angelicus [Cologne] 7 (2007): 89–108. [PDF]

  • “The Ecstasy of Love in Aquinas’s Commentary on the Sentences.” Angelicum 83 (2006): 51–93. [PDF]

  • “Doing and Speaking in the Person of Christ: Eucharistic Form in the Anaphora of Addai and Mari.” Nova et Vetera 4 (2006): 313–79. [PDF]

  • “Aquinas’s Sermon for the Feast of Pentecost: A Rare Glimpse of Thomas the Preaching Friar.” Introduced by P. A. Kwasniewski, translated from the Latin with Jeremy Holmes. Faith & Reason 30:1–2 (2005): 99–139. [PDF]

  • “A Tale of Two Wonderworkers: St. Nicholas of Myra in the Writings and Life of St. Thomas Aquinas.” A study accompanied by St. Thomas’s sermon for the feast of St. Nicholas. Angelicum 82 (2005): 19–53. [PDF]

  • “Anton Bruckner, Sacred Tonality, and Parsifal’s Redemption: Spiritual Enfleshment and the Musical Via Positiva.” Logos: A Journal of Catholic Thought and Culture 8.2 (Spring 2005): 17–55. [PDF]

  • “Golden Straw: St. Thomas and the Ecstatic Practice of Theology.” Nova et Vetera 2 (2004): 61–89. [PDF]

  • “William of Ockham and the Metaphysical Roots of Natural Law.” The Aquinas Review 11 (2004): 1–84. [PDF]

  • “‘Divine Drunkenness’: The Secret Life of Thomistic Reason.” The Modern Schoolman 82 (2004): 1–31. [PDF]

  • “Transcendence, Power, Virtue, Madness, Ecstasy—Modalities of Excess in Aquinas.” Mediaeval Studies 66 (2004): 129–81. [PDF]

  • “The World as Symbol of Divine Beauty in the Thought of St. Bonaventure.” Faith & Reason 24/25 (1999–2000): 31–54. [PDF]

  • “Solitude, Communion, and Ecstasy.” Communio 26 (Summer 1999): 371–92. [PDF]

  • “The Inseparability of Freedom, Goodness, and Final End in St. Thomas.” The Aquinas Review 5.1 (1998): 50–69. [PDF]

  • “Thales and the Origins of Rational Theology.” The Journal of Neoplatonic Studies 6.1 (Fall 1997): 75–104. [PDF]

  • “St. Thomas, Extasis, and Union with the Beloved.” The Thomist 61.4 (1997): 587–603. [PDF]

  • “The Metaphysics of Providential Causality in the Στοιξειωσισ Θεολογικη of Proclus.” The Journal of Neoplatonic Studies 5.2 (Spring 1997): 3–28. [PDF]

Popular Articles


(A selection follows.)

Did the Church ‘Forget’ the Holy Spirit until the ’60s? OnePeterFive, June 3, 2020.

Lessons from a Whisky Priest. Crisis, April 6, 2020.

The Second Vatican Council Is Now Far Spent. OnePeterFive, December 11, 2019.

Contemplative Religious: The Heart of the Church and the Measure of Her Health. OnePeterFive, October 2, 2019.

What is a Catholic Church Supposed to Look Like? OnePeterFive, September 4, 2019.

On Hell: Clarity Is Mercy in an Age of “Dare We Hope.” OnePeterFive, August 7, 2019.

“What Good is a Changing Catechism? Revisiting the Purpose and Limits of a Book.” Rorate Caeli, June 15, 2019.

Thomas Aquinas and the Healing Grace of Study. OnePeterFive, March 7, 2019.

Happy Catholics Don’t Make the Pope More than He Is. OnePeterFive, February 13, 2019.

RIP, Vatican II Catholicism (1962-2018). OnePeterFive, October 9, 2018.

No Matter How Bad You Think the Corruption Is, It’s Worse. OnePeterFive, August 15, 2018.

Lessons from Church History: A Brief Review of Papal Lapses. OnePeterFive, August 6, 2018.

The Cult of Change and Christian Changelessness. OnePeterFive, July 18, 2018.

The New Synthesis of All Heresies: On Nietzschean Catholicism.” OnePeterFive, May 16, 2018.

Are We God’s Sons and Daughters? OnePeterFive, April 5, 2018.

The ‘new atheists’ are the true enemies of science, not Christians. LifeSite News, February 27, 2018.

Who’s Afraid of Predestination? New Liturgical Movement, January 29, 2018.

A Dialogue between Two Monks Concerning the Papacy. OnePeterFive, December 13, 2017.

Hail, full of grace, the Lord is with thee: Why Mary is Mediatrix of All Graces. LifeSite News, December 12, 2017.

But the Pope said so!: Excuses that may not help on Judgment Day. LifeSite News, November 28, 2017.

Damned Lies: On the Destiny of Judas Iscariot. Rorate Caeli, March 30, 2015.

Why Catholics Are So Bad at Evangelizing—and What Has to ChangeOnePeterFive, November 22, 2017.

The Life of St. Thomas Aquinas and His Greatest Work. OnePeterFive, March 7, 2017.

Is Traditionalism a Spiritual Malady? New Liturgical Movement, November 14, 2016.

The Wedding of the Lamb. [Introduction to eschatology.] OnePeterFive, November 2, 2016.

A Brief Introduction to the Angels. OnePeterFive, September 8, 2016.

The Logic of Incarnation and the Temptation of DisincarnationNew Liturgical Movement, May 30, 2016.

Is Modern Man Irremediably Cut Off from Tradition? New Liturgical Movement, May 9, 2016.

Unction from Above or Reasoning from Below? A Small Illustration of the Importance of Critical Texts. New Liturgical Movement, March 28, 2016.

God Made Us for Heaven. OnePeterFive, March 21, 2016.

Purgatory and Hell: Forgotten Destinations (Parts I-IV). OnePeterFive, December 2015.

The Comparative Nobility of the Sacraments. New Liturgical Movement, November 9, 2015.

The Hypostatic Union as a Marriage. New Liturgical Movement, October 26, 2015.

Can Catholics Learn Today from the Continent Marriage of Joseph and Mary? New Liturgical Movement, October 19, 2015.

How is the Marriage of Joseph and Mary a True Marriage? New Liturgical Movement, October 12,

Incarnate Realism and the Catholic Priesthood. OnePeterFive, July 17, 2015.

On the Imitation of Animals. OnePeterFive, April 16, 2015.

The State of the Church and the State of Our Souls. OnePeterFive, March 31, 2015.

The Inspiration and Inerrancy of Scripture. OnePeterFive, March 2, 2015.

What Is Most Deeply Human: Two Contrasting Approaches to Nostalgia. New Liturgical Movement, December 30, 2013.

Rationalism and Individualism in Catholic Theology. New Liturgical Movement, September 23, 2013.

Continuity and Discontinuity in Liturgy and Theology. New Liturgical Movement, September 17, 2013.

What Is a Church Supposed to Look Like? The Latin Mass, Spring 2010.

Leviticus and the True Sacrifice. Homiletic & Pastoral Review, July 2009.

Rewriting the Inquisition—Roman Style. Homiletic & Pastoral Review, March 2005.

Rediscovering Modesty from Within.” Homiletic & Pastoral Review, October 2003.

Are Passions Good?” The Catholic Faith, September/October 2000.

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