Paley’s design argument

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Presentation transcript:

Paley’s design argument Michael Lacewing enquiries@alevelphilosophy.co.uk © Michael Lacewing

Life Isn’t life amazing? Organs serve a purpose – heart – pump blood, eye – seeing We understand parts of an organ in relation to serving this purpose A living organism requires huge coordination of tiny parts each functioning well (c) Michael Lacewing

Design The universe didn’t have to be like this – there could have been no order, no regularity Order of this kind, the way parts work together for a purpose, can indicate design If life involves design, by definition, there must be a designer (c) Michael Lacewing

Paley’s watch If you found a watch in a field, you would be right to infer that it had been designed – why? The property of having an organization of parts put together for a purpose Suppose the watch mechanically builds a new watch – this doesn’t explain the design of the second watch. (c) Michael Lacewing

Paley’s argument Natural things exhibit this same property of having parts organised for a purpose The reproduction of living things does not explain their design If the inference of a designer is correct in the case of the watch, it is correct in the case of living things The designer of nature must be A mind: design requires consciousness and thought Separate from the universe – the designer cannot be what is designed Is the designer God? A further question (c) Michael Lacewing

Paley Anything that has parts organized to serve a purpose is designed. Nature contains things which have parts that are organized to serve a purpose. Therefore, nature contains things which are designed. Design can only be explained in terms of a designer. A designer must be or have a mind and be distinct from what is designed. Therefore, nature was designed by a mind that is distinct from nature. Therefore, such a mind (‘God’) exists. (c) Michael Lacewing

Paley and analogy Hume objects that the analogy between human artefacts and natural things is weak Strictly speaking, Paley doesn’t offer an argument from analogy. He says that both artefacts and nature have the same property Paley: all we need, to infer a designer, is parts organised for a purpose This is sufficient in the case of the watch Even if we know nothing else about how watches are made (c) Michael Lacewing

Discussion If Hume’s objections apply to the inference regarding natural things, they should apply to Paley’s watch But perhaps they do! Perhaps, if we know nothing about watches (or anything similar), we aren’t justified in inferring that the watch in the field is designed (c) Michael Lacewing

Hume: Arguing from a unique case Causation: whenever you have the cause, you get the effect ‘Constant conjunction’ So you can’t know from a single instance, what causes what. Repeated experience is necessary to infer a causal relation. So if you nothing about how watches are made, you cannot infer a designer Paley: not so – the organization of parts for a purpose is sufficient (c) Michael Lacewing

Inference to the best explanation Hume suggests an alternative explanation to a designer: Suppose matter is finite and time is infinite. Then all arrangements of matter will occur, by chance, over time Paley: Finite matter, infinite time is a bad explanation We have no evidence that matter pushes into new arrangements We know that the arrangement of matter changes in accordance with the laws of nature Time isn’t infinite – the universe began just under 14 billion years ago © Michael Lacewing

Evolution by natural selection Darwin explained how the appearance of design is possible without design Genetic alterations happen randomly; most disappear. But those that improve reproduction survive and spread in a population, altering the species. Such alterations are not actually ‘selected’ – natural forces secure their survival But: what explains the order found in the laws of nature that enable evolution to occur? (c) Michael Lacewing