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Did Aquinas Reject the Immaculate Conception? episode artwork

EPISODE · Apr 23, 2026 · 1H 9M

Did Aquinas Reject the Immaculate Conception?

from Missio Dei Catholic · host Phillip Hadden, Andrew McGovern, Th.D., and Alex Spieldenner

Thank you to everyone who tuned into my live video! Please subscribe and follow Alex Spieldenner—a great philosopher and Thomist. In this special episode, we sit down with our in-house theologian, Andrew McGovern, and special guest Alex Spieldenner from Aquinas and Beyond to explore the Catholic dogma of the Immaculate Conception and St. Thomas Aquinas. We begin with Pope Pius IX’s historic 1854 ex cathedra definition: that Mary was preserved from all stain of original sin from the first moment of her conception by a singular grace and the merits of Jesus Christ. Why does this dogma matter? Did St. Thomas Aquinas actually deny the Immaculate Conception? * Deep dive into Summa Theologica III, Question 27 – what Aquinas actually taught * Mary’s holiness, sanctification in the womb, and grace fitting for the Mother of God * Medieval understanding of generation, ensoulment, animation, and “quickening.” * Why Aquinas emphasized that Mary (and everyone) needs Christ the Redeemer Blessed John Duns Scoutus’ and the Franciscan Teaching * Franciscan perspective: Bl. John Duns Scotus and his stronger emphasis on the Primacy of Christ * Scotus’ famous principle: “God could do it, it was fitting, therefore He did it.” * Comparison of Christology between Aquinas and Duns Scotus * Mary as the New Ark of the Covenant (with biblical reference to Uzzah in 2 Samuel 6) * What are Réginald Marie Garrigou-Lagrange OP’s thoughts on Duns Scotus? What would Aquinas think about the topic with our knowledge of biology and medicine? * What was Aquinas’ knowledge of the process of conception? * Philosophical and biological discussion: zygotes, the union of sperm and egg, and how modern science relates to Aquinas’ thought * Would St. Thomas Aquinas support first-trimester abortion? This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.missiodeicatholic.org/subscribe

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This episode was published on April 23, 2026.

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