Teleological argument: Eduqas A grade notes

Eduqas
Philosophy

For AO1 you need to know:

Aquinas’ 5th way
Paley’s design argument
Tennant’s anthropic and aesthetic arguments
Hume’s criticisms
Alternative scientific explanations e.g. evolution

For AO2 you need to be able to debate:

Whether inductive arguments for God are persuasive
The effectiveness of the teleological argument for God’s existence
Whether teleological arguments for God are persuasive in the 21st century
The effectiveness of the challenges to the teleological argument
Whether scientific explanations are more persuasive than philosophical explanations for the universe’s existence

AO1: Aquinas’ 5th way

Thomas Aquinas’ 5th Way is an a posteriori argument, meaning it reasons from experience to a conclusion.
It begins with the observation that natural objects do not behave randomly, but move towards a goal or purpose (telos).
Aquinas claims that things act “always, or nearly always” in the same way to obtain the best result, meaning they reliably attain their natural end.
The world therefore displays goal-directed behaviour.
Flowers turn towards the sun to maximise sunlight, acorns reliably grow into oak trees, and the planets move in stable and predictable orbits.
Everywhere we look, objects behave with regularity and direction rather than randomness.
This suggests that their behaviour is not the result of chance.
However, these objects cannot direct themselves towards their ends because they are non-intelligent or insufficiently intelligent.
Aquinas argues that something cannot consistently move towards a goal unless guided by something that understands that goal.
He illustrates this with the example of an arrow.
An arrow reaches its target, but only because it is directed by an archer.
The arrow itself has no awareness of its purpose.
In the same way, natural objects require an intelligent cause to direct them.
God fulfils this role by creating natural laws which govern objects and guide them towards their ends.
Just as an archer makes an arrow goal-directed, God makes the universe goal-directed.
So Aquinas concludes that the ordered and purposeful behaviour of the world points to an intelligent designer, “that which we call God”.
The argument is inductive, using observation as evidence.
It is part of Aquinas’ natural theology, showing how reason can support belief in a higher power.

AO1: William Paley’s design argument

William Paley’s design qua purpose argument claims that the combination of complexity and purpose in natural objects is best explained by a designer.
The argument is a posteriori because it reasons from experience to a conclusion.
Paley illustrates this with the example of a watch.
If you were walking on a heath and came across a rock, you could think it had always been there, since nothing about it suggests otherwise.
However, if you came across a watch, the situation is quite different.
There is something about a watch which suggests it had not always been lying there.
It is composed of parts intricately formed and arranged to produce a motion which tells the time.
It displays complexity organised towards a purpose.
If the parts were shaped differently, made of other materials, or arranged differently, the watch would not function.
So it could not have come about by chance nor existed eternally.
It must have had a designer, a watchmaker.

Paley then applies this reasoning to the natural world.
There are many things in the universe which are also complex and purposeful, such as the human eye, the wings of birds, and the fins of fish.
These are structured in ways that enable seeing, flying, and swimming.
As Paley states, “every manifestation of design” found in the watch is also found in nature.

Since complexity and purpose in a watch imply a designer, the same reasoning applies to the universe.
The designer must have a mind, because design involves intention and knowledge of how parts achieve a purpose.

The argument is inductive, as observed complexity and purpose provide evidence for the conclusion.
Paley’s approach is part of natural theology, aiming to show that reason supports belief in a higher power.
Although sometimes interpreted as analogical, the watch mainly serves as an illustration rather than a strict comparison.

AO1: F. R. Tennent’s aesthetic argument

F. R. Tennant develops an aesthetic argument as part of his wider teleological case for God’s existence.
He accepts evolution as the mechanism producing human beings, but argues that aesthetic consciousness fits more naturally within a theistic worldview.
Humans have a capacity to appreciate beauty in nature, art, music, and even mathematical elegance.
This seems to go beyond what is required for biological survival.
Natural selection can only favour traits that improve survival and reproduction.
However, we could survive without being moved by sunsets, inspired by music, or able to create art.
The richness of our aesthetic experience does not appear to provide a clear survival advantage.
So it is difficult to explain how this capacity developed through natural selection alone.
Tennant takes this as evidence that the aesthetic sense was designed.
He also notes that beauty is a widespread feature of the world.
Humans uniquely have the ability to recognise and respond to it.
This suggests the universe is not only suited to sustaining life, but also to producing beings capable of appreciating value.
For Tennant, this points to a cosmos that is not just mechanical but value-laden.
The world appears ordered in a way that allows higher experiences such as beauty.
Our aesthetic sensitivity is therefore one strand in a cumulative case for God.
It suggests the world is not accidental, but intentionally structured by a designer.

AO1: F. R. Tennent’s anthropic argument

F. R. Tennant develops the design argument to avoid it being undermined by Darwin.
He argues that evolution itself requires a very specific kind of universe, which suggests design.
So evolution does not remove design, but shows it on a wider scale than just biology.
Tennant calls this an anthropic argument, because it focuses on the conditions that make rational human life possible.
He identifies several strands which together support theism.
First, he points to the order and intelligibility of the universe.
Nature operates through stable and rational laws which make scientific understanding possible.
There is no necessity that reality should be ordered rather than chaotic.
So this order calls for explanation.
Second, Tennant highlights fine-tuning.
Life depends on very precise values of physical constants such as gravity, electromagnetism, and nuclear forces.
It also depends on conditions like atomic stability, water, and carbon.
These factors combine in highly specific ways that make life possible.
Tennant compares this to a throw of dice landing exactly right, suggesting they may have been “loaded”.
Third, he argues that evolution shows directionality.
There is a general movement from simple life to complexity, consciousness, and moral awareness.
There is no guarantee evolution would produce these features, so their emergence adds further evidence of design.
Tennant concludes that these strands form a cumulative case.
The universe appears structured to produce rational life, which supports belief in a designer.

AO2: The validity of analogy

Swinburne defends analogical reasoning as scientifically valid.
If we observe X and know it is similar to Y, whose cause we understand, it is rational to infer a similar cause.
Design arguments apply this to nature.
Objects in nature resemble artefacts or directed objects like watches or arrows.
So their cause is likely analogous, an intelligent mind.
This makes analogy a legitimate way of reasoning from known to unknown causes.

Counter

However, Hume argues that similar effects can have very different causes.
For example, dry ice and fire both produce smoke but arise from different causes.
So similarity does not justify inferring similar causes.
He also claims the analogy between artefacts and the universe is weak.
Artefacts are precise and mechanical, while the universe appears more organic and irregular.
So the comparison between watches and natural objects lacks sufficient similarity.

Evaluation

Hume’s critique fails against stronger interpretations of design arguments.
Many modern readings of Paley do not rely on analogy but on inference to the best explanation.
The watch is better seen as an illustration of how complexity and purpose typically arise from minds.
The argument instead focuses on the improbability of such features arising by chance.
This removes dependence on the strength of analogy.
The same applies to Aquinas’ 5th way, where the arrow illustrates goal-directedness rather than forming a strict comparison.
So Hume targets a weaker version of the argument.
Once reformulated probabilistically, design arguments avoid his criticism.

AO2: Hume’s critique: God not the only explanation

Hume argues that even if the design argument succeeds, it cannot prove the Christian God in particular.
Alternative explanations remain equally possible, such as multiple gods, a limited designer, or a god who later died.
There is no basis for preferring the Christian God over these options.
So the argument could be inductively cogent, yet still limited in scope.

Counter

Swinburne responds using Ockham’s razor, arguing that one God is a simpler explanation than many.
More importantly, Aquinas, Paley and Swinburne do not aim to prove the Christian God.
Their arguments belong to natural theology, using inductive a posteriori reasoning to support belief.
Evidence for a generic designer still increases the plausibility of a specific God.

Evaluation

Hume’s critique overreaches because it targets a stronger claim than design arguments intend to make.
Sophisticated defenders are careful to limit their conclusion to a generic designer.
Aquinas explicitly ends his argument by referring to “that thing we call God,” showing awareness of this limitation.
The argument is not meant to establish the full nature of God, but to provide a rational foundation for belief.
Faith then identifies this designer as the Christian God.
This division of labour between reason and faith is central to natural theology.
So Hume’s objection commits a straw man by assuming the argument aims to prove more than it does.
The limitation in scope is not a weakness, but an intended feature of the argument.

AO2: The epicurean hypothesis & the multiverse

David Hume’s epicurean hypothesis suggests that if the universe were eternal, random atomic combinations would eventually produce order by chance.
Given infinite time, even highly ordered structures would occur.
Hume does not claim this is true, only that it is possible.
This breaks the claim that order must come from God.
A modern example which makes the same point would be the multiverse, where many universes exist, making ordered ones unsurprising and explicible by chance.

Counter

However, Swinburne argues the multiverse is highly speculative and lacks direct evidence.
It may also be unfalsifiable, so it cannot function as a proper scientific explanation.
Swinburne concludes that science can describe laws but cannot explain why those laws exist at all.

Evaluation

Nonetheless, the multiverse remains a serious challenge to design arguments.
Even if it is speculative, it is not incoherent and is taken seriously in physics.
More importantly, Hume’s point does not depend on it being true, only possible.
If another explanation of order is available, the inference to God is no longer necessary.
This weakens the force of design arguments, which aim to show that God is the best explanation of the universe.
If the multiverse can explain order and fine-tuning just as well, then God is no longer especially supported by the evidence.
We have no reason to prefer the God hypothesis.
So the design argument loses its persuasive power.

AO1: Darwinian evolution vs design

William Paley and Thomas Aquinas appeal to the complexity and purpose of organisms as evidence of design.
However, Darwinian evolution by natural selection provides an alternative explanation.
There is variation within species, and individuals better adapted to their environment are more likely to survive and reproduce.
They pass on genes coding for advantageous traits, which become more common over time.
This leads to increasing adaptation across generations.
As a result, organisms appear designed for survival.
In reality, these traits developed gradually through natural selection rather than intentional design.
Features such as instincts and goal-directed behaviour can be explained this way.
So what Aquinas described as a telos can instead be understood as the outcome of evolutionary processes.
Richard Dawkins develops this critique in The Blind Watchmaker.
Referring to Paley’s example of the eye, he argues that complex organs can evolve step by step over long periods.
Each stage offers a small advantage, allowing gradual development of complexity.
Dawkins concludes that there is a “watchmaker”, but it is blind, meaning natural selection rather than a conscious designer.
So complexity and purpose can be explained through natural processes, making belief in a designer unnecessary.

AO2: Hume & Darwin on Design vs the problem of evil

Charles Darwin argued that the cruelty of natural selection undermines belief in design.
He pointed to cases like parasitic wasps, whose larvae consume hosts alive, as evidence against a benevolent designer.
David Hume develops this into the evidential problem of evil.
If the world were designed by a perfect God, unnecessary suffering could have been avoided.
So natural evil counts as evidence against a perfect creator.

Counter:

Religious philosophers attempt to respond with theodicies.
These generally claim it is logically impossible for God to remove evil without also removing some greater good necessarily connected to evil.
E.g., our deserved punishment for Augustine, free will for Plantinga or soul-making for Hick.

Evaluation:

These responses fail to address the evidential force of natural evil.
Suffering inflicted on innocent children and animals cannot plausibly be justified by free will or punishment.
Hick’s soul-making defence claims that random suffering is necessary to preserve epistemic distance, but this is unfalsifiable and lacks empirical support.
So while God’s existence may be logically consistent with evil, it cannot be inferred from the evidence.
This directly undermines the aim of design arguments.
Natural theologians like Thomas Aquinas and William Paley appeal to observation to support faith in a perfect God.
But once all the evidence is considered, including suffering, the world appears imperfect.
So the most reasonable inference is not to a perfect designer, but to an imperfect or limited cause.

AO2: Design arguments after Darwin

F. R. Tennant and Swinburne develop design arguments beyond biology to the structure and intelligibility of the universe.
Swinburne argues Aquinas’ focus on temporal order is stronger than Paley’s spatial order.
Evolution may explain organisms, but not why laws of nature exist.
The precise constants required for life suggest fine-tuning by a designer.

Counter

This assumes the laws of nature could have been different.
However, they may be metaphysically necessary rather than contingent.
Physicists search for a unified theory that explains why the constants must be as they are.
Just because we can imagine different laws does not mean they are really possible.
So fine-tuning may not require explanation by God.

Evaluation

The broader problem is that design arguments rely on gaps in scientific explanation.
Even in their refined form, they risk becoming a God-of-the-gaps argument.
Evolution showed that Paley’s appeal to complexity was misplaced, but more importantly, it revealed a deeper issue.
Lack of explanation does not justify inferring God.
This same mistake appears in fine-tuning arguments.
Just because we cannot currently explain the laws of nature does not mean God is the best explanation.
Future science may provide deeper explanations, such as necessary laws or unified theories.
So the argument rests on temporary ignorance rather than strong evidence.
This makes modern design arguments no more convincing than earlier versions.