Aquinas on Creation: Divine Act and Rational Design

When Thomas Aquinas sat down to write his monumental Summa Theologica in the 13th century, he was entering a battlefield of ideas. On one side stood the towering authority of Aristotle – and Aristotle’s influential Islamic interpreter Averroes – both insisting that the universe had always existed and always would. On the other stood the Christian doctrine that God created everything from nothing. Aquinas did not simply choose a side. He built a philosophical architecture that reframed the entire question, arguing that God is not merely the best explanation for the world’s existence – God is its only possible explanation. Understanding Aquinas on creation means understanding one of the most sophisticated attempts in Western philosophy to reconcile reason, theology, and the nature of reality itself.

The problem Aquinas was responding to 🔗

Before getting to Aquinas’s own position, it helps to understand what he was arguing against. Aristotle held that the universe is eternal – without beginning or end – operating according to immutable natural laws. He proposed the concept of an “unmoved mover,” a divine first cause that initiates motion but is itself static and impersonal. Averroes, following Aristotle closely, doubled down on this view: the universe is a necessary, eternally existing reality, dependent on the divine but never actually brought into being. For Averroes, the world simply always was.

This posed a direct challenge to Christian theology. If the universe is eternal and necessary, then God is not really a creator in any meaningful sense – just an abstract backdrop to a self-sustaining cosmos. The Christian doctrine of creatio ex nihilo – creation from nothing – insisted on something far more radical: that matter itself is not eternal, and that God brought everything into existence through a free and sovereign act of will.

Aquinas accepted this doctrine, but he also refused to simply dismiss Aristotle. Instead, he took Aristotelian logic and turned it toward a very different conclusion.

God as the uncaused cause and immovable mover 🔗

At the heart of Aquinas’s philosophy of creation are his Five Ways – five arguments for God’s existence laid out in the Summa Theologica. The first two are especially important for understanding his view of creation.

The argument from motion 🔗

Aquinas begins with a simple observation: things in the world move and change. Whatever is in motion must be put in motion by something else, and this chain of movers cannot regress infinitely – there must be a first unmoved mover, which itself is not in motion. This, Aquinas concludes, is what everyone understands to be God.

But Aquinas is careful here to distinguish his unmoved mover from Aristotle’s. Aristotle’s first mover initiates motion through a kind of self-motion, but Aquinas rejects this – because if something can move itself, it implies a composition of parts (a part that moves and a part that is moved), and God cannot be composite. God, for Aquinas, lacks all potentiality. He is pure act – entirely what He is, with nothing left unrealized. This makes Him radically different from everything in the created world, which always has some unrealized potential.

The argument from causation 🔗

Aquinas observes that in the natural world, nothing can be the efficient cause of itself – it would have to exist prior to itself, which is a contradiction. The chain of efficient causes cannot go back infinitely, so there must be a first uncaused cause. This first cause is God.

The crucial philosophical move here is that God is not just the first item in a long causal chain. Divine causality in Aquinas is more radical than efficient causation – it answers the question of why there is anything at all, not merely how the chain of events began. God is not simply a being among other beings, even of the most perfect kind. He is the ground of being itself – the reason existence exists rather than nothing.

Creation ex nihilo: what it actually means 🔗

Creatio ex nihilo – literally “creation out of nothing” – is the doctrine that matter is not eternal but was brought into being by a divine creative act. For Aquinas, this is not just a theological claim; it has deep philosophical implications.

The most important of these is what it says about God’s nature. The primary meaning of ex nihilo is the denial of ontological dualisms – the affirmation of God’s non-contrastive transcendence over every kind of dependence or limitation. In the Greek philosophical traditions that preceded Aquinas, creation was typically understood as a process involving some pre-existing material – chaos, prime matter, or eternal forms – that the divine shaped or ordered. Aquinas breaks completely with this. God does not work with pre-existing material because there is no pre-existing material. God creates the very substrate of reality.

Aquinas’s metaphysics of creatio ex nihilo shows the wisdom-based, ratiocinative foundation of reality – a reality that comes from the personal creative act of God. This is not irrational or arbitrary; it is grounded in God’s intelligence and goodness. The universe is not a cosmic accident. It is the expression of divine reason.

Could the world be both created and eternal? 🔗

One of the more surprising aspects of Aquinas’s position is that he does not think philosophy alone can prove the universe had a temporal beginning. Aquinas affirmed the Christian doctrine of creation in time on the basis of divine revelation, yet he simultaneously maintained that if God had wanted to create an eternal world from nothing, He certainly could have – He just didn’t. For Aquinas, whether the universe had a beginning in time is a question of faith informed by Scripture, not something pure reason can settle either way.

What reason can establish is that the universe is dependent – that it requires God as its ongoing cause of being, regardless of whether it had a first moment. Whether the cosmos has always existed or began at a specific moment, God continuously makes it be – a process Aquinas calls creatio continua. The world is not like a clock that God wound up and left running; it depends on God’s sustaining power at every instant of its existence.

A rational and free act of divine will 🔗

One of Aquinas’s most important philosophical contributions is his insistence that creation is both rational and free. This might sound like a simple point, but it cuts against two very different errors.

Against the Neoplatonists (and Averroes), Aquinas insists creation is not necessary – not an automatic overflow or emanation from a perfect being that couldn’t help producing the world. There is no reason to conclude that creating places any constraint on divine freedom because it is a free act of love entirely consistent with God’s nature. God did not have to create. He chose to. This means the universe is a gift, not a byproduct.

Against any view that makes creation arbitrary or random, Aquinas insists it is rational. God creates according to His own wisdom and goodness. The universe is not a random collection of things but an ordered whole, shaped by divine intelligence toward a purpose. This is what gives the world its intelligibility – the reason human reason can understand it at all.

Divine providence and the teleological order 🔗

Creation, for Aquinas, is not a one-time event that God walked away from. It opens into an ongoing relationship between Creator and creation that he calls divine providence.

For Aquinas, every created being has its own natural perfection that in some way reflects God’s goodness – and this natural perfection is governed by divine providence. The universe is not a neutral or indifferent place; it is oriented toward the good. Everything that exists has an end toward which it naturally tends, and these ends are ultimately ordered toward God as the final cause of all things.

Aquinas’s worldview is thoroughly teleological – he holds that it is necessary that all agents act for the sake of an end. This includes not just conscious agents like humans but all of nature. The Summa Theologica‘s fifth way makes this point directly: even things without intelligence act consistently toward the best result, not by chance but by design – directed by an intelligent being, which is God.

Does providence eliminate human freedom? 🔗

This is perhaps the sharpest philosophical tension in Aquinas’s account. If God governs everything, does human freedom disappear? Aquinas’s answer is decisive: no, and in fact the opposite is true.

In the Summa Theologica, Aquinas argues that God is the first cause who moves both natural and voluntary causes – but just as moving natural causes does not prevent their acts being natural, moving voluntary causes does not deprive their actions of being voluntary. He operates in each thing according to its own nature. Human freedom is not in competition with divine causality; it is grounded in it. God causes us to be free.

Among all creatures, the rational creature participates in divine providence in a more excellent way, by being provident for itself and for others – sharing in the eternal reason through natural law. Human beings are not passive recipients of providence; they are active participants, endowed with reason and free will to direct themselves toward the good.

The goodness of creation 🔗

There is a moral dimension to Aquinas’s philosophy of creation that is easy to overlook. Because God is good, and because the world proceeds entirely from God’s free and rational will, the world is fundamentally good. This is not naive optimism – Aquinas fully acknowledges the reality of evil and imperfection in the world. But he explains these as consequences of the freedom given to rational creatures, not defects in God’s creative act itself.

The teleological framework that circumscribes Aquinas’s moral philosophy extends outward from creation: because everything is created with a nature and an end, ethics becomes a matter of understanding what we are and what we are for. What is ultimately best for us is an understanding of the world and its Creator – what we were created to do. By pursuing this substantive goal, we make ourselves as good as we can be.

This is the elegant coherence of Aquinas’s vision: creation is rational (it comes from God’s wisdom), free (it comes from God’s will), good (it reflects God’s nature), and purposeful (it is ordered toward God as its final end). Each element supports the others. Pull one away and the whole structure changes.

Why this still matters philosophically 🔗

Aquinas’s philosophy of creation is not simply a medieval theological position. It raises questions that remain live in contemporary philosophy of religion, cosmology, and metaphysics. The debate between creation and eternalism – whether the universe had a beginning or has always existed – maps surprisingly well onto modern discussions around the Big Bang and quantum cosmology. Thomistic scholars like William Carroll have argued that Aquinas’s doctrine of creatio ex nihilo is not about getting closer to creation by getting closer to the Big Bang – the metaphysical question of why there is something rather than nothing is distinct from any empirical question about the universe’s first moments.

More broadly, Aquinas shows that the idea of a created universe is not anti-rational. It is, on his account, the most rational conclusion available: a universe that exists contingently, is intelligible, ordered toward the good, and sustained by a necessary being whose existence requires no external explanation. Whether one accepts his theology or not, the philosophical architecture is among the most carefully constructed in the Western tradition.

What do you think? If God’s creative act is both rational and free, does that make the universe more or less meaningful than one that simply always existed by necessity? And can divine providence – the idea that God actively guides creation toward its proper end – genuinely coexist with authentic human freedom, or does one inevitably limit the other?

References

1. https://en.wikipedia.org/wiki/Creatio_ex_nihilo
2. https://en.wikipedia.org/wiki/Five_Ways_(Aquinas)
3. https://sophiachristianacademy.com/lesson/eternal-reason-chapter-5-aquinas-and-the-five-ways/
4. https://credmag.com/article/thomas-aquinas-on-the-unmoved-mover/
5. https://onlinelibrary.wiley.com/doi/full/10.1111/nbfr.12603
6. https://philpapers.org/rec/MARPCT-17
7. https://afkimel.wordpress.com/2016/02/01/st-thomas-aquinas-does-creatio-ex-nihilo-exclude-an-everlasting-universe/
8. https://www.tandfonline.com/doi/full/10.1080/20465726.2025.2503110
9. https://plato.stanford.edu/entries/aquinas/
10. https://afkimel.wordpress.com/2023/11/01/st-thomas-aquinas-divine-providence-free-will-and-determinism/
11. https://people.wku.edu/jan.garrett/302/aquinlaw.htm
12. https://iep.utm.edu/thomasaquinas-moral-philosophy/
13. https://philarchive.org/archive/SILTAA-5