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In this episode, we explore St Thomas Aquinas’ First Way, also known as the Argument from Motion. This is one of the most influential philosophical arguments for the existence of God.
Building on our introduction to cosmological arguments, we unpack Aquinas’ reasoning step by step. What does he mean by “motion”? Why does every change require a cause? And how does observing change in the world lead Aquinas to conclude that there must be an Unmoved Mover upon whom everything else depends?
In this episode, we discuss:
- What Thomas Aquinas means by “motion”
- The difference between potentiality and actuality
- Why nothing can move itself from potential to actual
- How chains of simultaneous cause and effect differ from causes stretching through time
- Aquinas’ distinction between primary and secondary causes
- Why an infinite hierarchical series of causes cannot explain change
- The meaning of the Unmoved Mover
- Why Aquinas’ First Way is a philosophical argument for God’s existence, and not yet a complete proof of every Christian belief about God
This episode is part of our series on St Thomas Aquinas’ Five Ways and the classical arguments for the existence of God. Whether you’re interested in philosophy, Catholic theology, apologetics, metaphysics, or the relationship between faith and reason, I hope these episodes help make Aquinas’ thought more accessible and encourage you to explore his arguments for yourself.
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