What does it mean to say that God cannot change? And why did the vast majority of the Christian tradition affirm the doctrines of divine immutability and impassibility? In this episode, Anthony Alberino explores the classical Christian understanding of God’s changelessness through the metaphysics of Aristotle and Thomas Aquinas. By examining the principles of act and potency, divine simplicity, and pure actuality, we see why a perfect and necessary being cannot undergo change or be acted upon. Far from implying a distant or lifeless deity, the classical doctrine reveals God as the infinite act of existence itself—the ultimate source of life, activity, and love. The episode also addresses common objections and explains how Christ’s human experiences fit with the Church’s teaching on God’s immutability, as articulated at the Council of Chalcedon. Topics covered: Divine Immutability • Divine Impassibility • Act and Potency • Pure Act • Classical Theism • Thomistic Philosophy • The Incarnation Subscribe for more episodes on classical theism, philosophy, and Christian theology.