AO1: Paley’s design qua purpose (watch)
- William Paley asks us to imagine finding a rock on a heath.
- The rock could have existed forever, since nothing about it suggests design.
- But if we found a watch, we would think differently.
- A watch has complex parts arranged to perform the purpose of telling the time.
- Paley argues that complexity alone does not show design.
- For example, sand on a beach can form complex patterns by chance.
- However, a sandcastle is different because its parts are arranged to serve a purpose.
- This makes it reasonable to think it was designed.
- So design is shown when complexity produces a purpose.
- Paley says this is also seen in nature.
- The eye, wings, and fins are complex structures that allow seeing, flying, and swimming.
- So nature appears to be designed.
- Because nature is greater than human objects, its designer must also be greater.
- This designer must be a mind that is separate from the world.
- The argument is inductive and a posteriori, using observation as evidence for the existence of God.
AO1: Swinburne’s anthropic design argument
- Richard Swinburne develops the design argument by focusing on temporal order.
- He criticises William Paley’s focus on spatial order, such as the arrangement of parts in a watch.
- Swinburne argues this is weak because science can explain it, for example through evolution.
- Instead, he looks at how things behave over time.
- Objects follow consistent patterns, like atoms behaving the same way over long periods.
- This shows there are laws of physics.
- Swinburne argues science cannot explain why these laws exist.
- It can describe them, but not explain why they are like they are.
- He then says that minds can create order.
- Humans create routines and patterns in their behaviour.
- So minds are known causes of order over time.
- Therefore, the best explanation of the laws of nature is a mind.
- Since these laws govern the whole universe, this mind must be God.
AO1: The status as a proof of the design argument
- Design arguments are a posteriori, meaning they are based on observation of the world.
- For example, Paley looks at complexity and purpose in nature.
- They are also inductive, meaning their premises support the conclusion but do not prove it.
- Inductive arguments are not certain.
- They show what is most likely based on the evidence we have.
- They are also defeasible, meaning new evidence could change or weaken them.
- So they can always be challenged.
- Design arguments often use analogy.
- We compare something we cannot explain with something similar we can explain.
- This helps us suggest a likely cause.
- Aquinas used these arguments in natural theology.
- They are not meant to prove the Christian God directly.
- Instead, they support belief in a designer, making faith more reasonable.
AO2: The validity of analogy
- Swinburne argues analogy is a valid way of reasoning.
- If something is similar to something else, we can infer a similar cause.
- Design arguments use this by comparing nature to human creations.
- So it is reasonable to infer a designer.
Counter
- Hume argues similar things can have different causes.
- For example, different processes can produce the same effect.
- He also says the universe is not very similar to a machine.
- So the analogy is weak and unreliable.
Evaluation
- Hume’s criticism is not decisive.
- Paley’s argument can be understood as focusing on complexity and purpose, not just analogy.
- The watch example is mainly an illustration.
- This avoids the problem of weak comparison.
- Aquinas’ arrow example can also be read this way.
- So the argument does not depend on analogy alone.
- This means Hume’s objection does not fully undermine the design argument.
AO2: Hume’s critique: God not the only explanation
- David Hume argues the design argument cannot prove the Christian God.
- Other explanations are possible, such as many gods or a limited designer.
- So even if the argument works, it cannot justify belief in any particular God.
Counter
- Richard Swinburne argues one God is the simplest explanation.
- Also, Thomas Aquinas and William Paley never aimed to prove the Christian God.
- They only aim to show a designer exists, which supports faith.
Evaluation
- Hume’s criticism is not convincing because it misunderstands the aim of the design argument.
- Aquinas clearly limits his conclusion to “that thing we call God,” showing it is not meant to prove the Christian God fully.
- The argument only aims to support belief in a designer.
- Faith then identifies this as the Christian God.
- So the limited scope is intentional, not a flaw.
- Hume therefore attacks a claim the argument does not actually make, so his critique fails.
AO1: Darwinian evolution vs design
- William Paley and Thomas Aquinas argue that complexity and purpose show design.
- Darwinian evolution offers another explanation.
- There is variation in species, and those better adapted survive and reproduce.
- They pass on useful traits, which become more common over time.
- This makes organisms appear designed for survival.
- Features like instincts and behaviour can be explained by this process.
- So what Aquinas called a telos can be explained by natural selection.
- Richard Dawkins argues that complex organs like the eye developed gradually.
- This creates the appearance of design without a designer.
- So complexity and purpose can be explained naturally, making a designer unnecessary.
AO2: Design arguments after Darwin
- Tennant and Swinburne argue that design is shown in the laws of nature rather than just in living things.
- Evolution may explain how organisms develop, but it does not explain why the universe has precise laws that allow life.
- These conditions seem highly unlikely, so fine-tuning suggests a designer.
Counter
- This argument assumes the laws of nature could have been different.
- However, it is possible that they are necessary and could not have been otherwise.
- Scientists also aim to find deeper explanations of these laws.
- So fine-tuning may not need God as an explanation.
Evaluation
- Design arguments still rely heavily on gaps in scientific knowledge.
- Evolution showed that earlier arguments from complexity were mistaken, and this raises doubts about newer versions too.
- Just because we do not currently understand something does not mean God is the correct explanation.
- Science may eventually explain why the laws of nature are as they are.
- So the argument depends on what we do not yet know, rather than strong positive evidence.
- This makes it weak, as it assumes God explains what science has not yet explained.
AO1: Strength & weakness of design arguments
- The validity of analogy
- Strength: Analogical reasoning is valid as it’s used by scientists all the time, e.g., to understand an unknown disease from the analogy of its symptoms to a known one.
- Weakness: Analogical reasoning in design arguments is weak, as similarities in effects do not always imply similar causes.
- Darwinian evolution
- Weakness: Darwinian evolution explains the appearance of design in organisms through natural selection, making a designer unnecessary.
- Strength: Modern developments like fine-tuning shift the focus from animal biology to the order and purpose in the laws of the universe, which evolution cannot explain away.
- Whether God is the only explanation
- Weakness: The design argument cannot establish the Christian God, as multiple or limited designers remain equally possible explanations.
- Strength: Natural theology underpins the design argument, which intentionally limits its conclusion to a generic designer, making belief in God more reasonable without overreaching its evidence.