91 - Aquinas' Five Ways Pt. 2

91 - Aquinas' Five Ways Pt. 2

Author: Dr Caitlin West April 28, 2025 Duration: 28:09

In this episode, we continue our deep dive into the question: How do we know God exists?

Today we will wrap up our discussion of St. Thomas Aquinas's Five Ways by analysing the Fourth Way (the argument from gradation/degree) and the Fifth Way (the argument from order).

Aquinas' Five Ways are among the most famous arguments for the existence of God, and they have been hugely influential in the history of the Philosophy of Religion. They have also been at times misunderstood and misrepresented, so in this series, we're taking the time to delve deep and understand what, exactly, Aquinas is arguing.

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Contact the podcast: crashcoursecatholicism@gmail.com.

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References and further reading/listening/viewing:

Summa Theologiae Part 1, Question 2⁠

⁠Summa Contra Gentiles⁠

Edward Feser:

⁠Aquinas: A Beginner's Guide⁠

⁠Five Proofs of the Existence of God

Empirical science and the transcendentals

Four Causes and Five WaysRéginald Garrigou-Lagrange, The one God: a commentary on the first part of St. Thomas' Theological summa.

The Thomistic Institute:

St. Thomas Aquinas' Fifth Way & Arguments from Modern Science (Aquinas 101)

St. Thomas' SIMPLEST Proof for the Existence of God (Aquinas 101)Thomas Joseph White #9: The Fifth Way (I, 2, 3)

Thomas Joseph White #8: The Fourth Way (I, 2, 3)

Why is the Fourth Way the LEAST Popular of St. Thomas' Five Ways? (Aquinas 101)

Why Does Truth Depend Upon Being in St. Thomas' Fourth Way? (Aquinas 101)

The Fourth Way: If You’re the Tallest, You’re Also a Cause! (Aquinas 101)

Pints With Aquinas: Explaining Thomas Aquinas' Proofs


For anyone curious about the foundations, traditions, and everyday implications of the Catholic faith, Crash Course Catholicism offers a thoughtful and accessible entry point. Hosted by theologian Dr Caitlin West, this podcast breaks down complex theological concepts, historical context, and Church teachings into clear, manageable conversations. Each fortnightly episode focuses on a specific topic-from the sacraments and scripture to moral philosophy and liturgical practice-providing listeners with a structured yet engaging overview. Dr West’s approach is both scholarly and welcoming, making centuries of tradition feel relevant and comprehensible. Whether you're a lifelong parishioner seeking a refresher, someone exploring spirituality, or simply a person with questions about the world's largest Christian denomination, this series is designed to inform without overwhelming. Tune in for a calm, considered journey through the pillars of Catholic thought, all delivered in short, easy-to-digest segments perfect for a daily commute or quiet moment of reflection. You can find more from Dr Caitlin West and the podcast at her website.
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