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Nicaea at 1700: The Creed That Changed the World | Angelicum Conversations with Prof. Lewis Ayres

Angelicum Conversations

As the Church marks the 1700th anniversary of the Council of Nicaea (325–2025), Fr. Thomas Joseph White, O.P., Rector of the Angelicum, speaks with Prof. Lewis Ayres, one of the world’s leading experts on early Christian theology, about the enduring significance of Nicaea. They discuss what the Council achieved, how its vision of Christ and the Trinity continues to shape Christian faith today, its role in Catholic-Orthodox dialogue, and the significance of Pope Leo XIV’s upcoming visit to Turkey to commemorate this milestone in Church history. 👉 Full transcript & show notes: https://media.angelicum.it/online-series/angelicum-conversations/episode-2-nicaea-at-1700-the-creed-that-changed-the-world/ 📖 Angelicum Conversations is a new interview series from the Pontifical University of St. Thomas Aquinas (the Angelicum) in Rome. Each episode features thoughtful dialogue on theology, philosophy, and culture—conversations that reflect the Angelicum’s mission of serving the Church through study, contemplation, and teaching. 💬 Share your thoughts in the comments below—we’d love to hear your perspective. 👉 Explore more episodes in the Angelicum Conversations series:    • Angelicum Conversations   🎥 Check out the Angelicum's new video series on Catholic Social Teaching:    • Catholic Social Thought (CST): The Fratern...   🎓 Learn more about the Angelicum: https://angelicum.it/ 0:00 Introduction 1:20 Background to the Council of Nicaea 6:00 What Is Arianism? 10:03 What’s Wrong with Arianism? 11:42 What Does Nicaea Say? The Two Statements of the Creed 13:55 The Meaning of “Homoousios” in the Creed 15:46 Reception of Nicaea & Theology of the Trinity 19:41 Why Do Expressions of the Faith Change Over Time? 21:45 Development of Doctrine 24:07 Why Does Nicene Theology Matter Today? 27:17 The Nicene Creed & Scripture 30:03 The Nicene Creed & Ecumenism (Catholic, Orthodox, Protestant) 33:22 Visit of Pope Leo XIV to Turkey & Catholic-Orthodox Relations 35:00 Advice for Young Theologians & Theological Literacy 38:00 Conclusion