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25 Jan 2026

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Exploring Aquinas' Three Ways in the Cosmological Argument

Maddie

@maddie_vzva

Ever wondered how philosophers try to prove God exists using... Show more

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Cosmological Argument according to St Thomas Aquinas

Summary of Aquinas' First Way -The Argument from Motion (any t

Aquinas' Cosmological Arguments - The Basics

You've probably noticed that everything around you seems to be in constant motion or change - from wood burning in a fire to leaves falling from trees. Aquinas used these everyday observations to build logical arguments for God's existence.

His approach was brilliant in its simplicity: start with something everyone can observe, then follow the logic step by step. The cosmological argument works by examining cause and effect relationships in the universe and asking what started it all.

The key insight behind all three arguments is that infinite regress (going back forever with no beginning) seems impossible. If there's no first cause or prime mover, then nothing should exist at all - but clearly, we do exist!

Quick Tip: Think of it like dominoes falling - if there's no first domino to knock over, none of the others would fall either.

The Three Ways Explained

The First Way $Motion/Change$ starts with the fact that things are constantly changing around us. Since nothing can move or change itself, something else must cause each change. Following this chain backwards, there must be a prime mover - an unchanged changer that started everything moving.

The Second Way (Causation) follows similar logic but focuses on cause and effect. Every event has a cause, and nothing can cause itself. To avoid an impossible infinite chain of causes, there must be a first cause that wasn't caused by anything else.

The Third Way (Contingency) distinguishes between contingent beings (things that could exist or not exist, like you and me) and necessary beings (things that must exist). Since contingent things alone can't explain why anything exists at all, there must be at least one necessary being.

Remember: All three arguments conclude that this first cause, prime mover, or necessary being is what we call God - though critics question whether this assumption is justified.

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Religious Studies

•

25 Jan 2026

•

2 pages

Exploring Aquinas' Three Ways in the Cosmological Argument

Maddie

@maddie_vzva

Ever wondered how philosophers try to prove God exists using logic and reasoning? St Thomas Aquinas developed three famous arguments called the "Three Ways" that attempt to demonstrate God's existence through observing the natural world around us.

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Aquinas' Cosmological Arguments - The Basics

Quick Tip: Think of it like dominoes falling - if there's no first domino to knock over, none of the others would fall either.

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The Three Ways Explained

Remember: All three arguments conclude that this first cause, prime mover, or necessary being is what we call God - though critics question whether this assumption is justified.