IB Philosophy 10.1.2 Implications for Philosophy and Metaphysics Notes

Ayer's Case Against Metaphysics

1. As established in 10.1.1, the verification principle divides all meaningful propositions into analytic (true by definition) and synthetic (empirically verifiable). Ayer's most radical application of this principle is his wholesale elimination of metaphysics as a legitimate area of inquiry.
2. Ayer's chapter "The Elimination of Metaphysics" in Language, Truth and Logic argues that metaphysical statements are not merely false but literally nonsensical: they fail to express any proposition because no possible experience could verify or falsify them.
3. Ayer targets specific metaphysical traditions by name. He dismisses F.H. Bradley's claim that 'the Absolute enters into, but is itself incapable of, evolution and progress' as a sequence of words that expresses no genuine proposition.
4. The sentence has grammatical form but no cognitive content: a grammatically well-formed sentence can still be philosophically empty.
5. Ayer distinguishes his position from traditional empiricist scepticism (the view that we simply cannot know whether metaphysical claims are true). Hume and Kant treated metaphysical claims as unprovable rather than meaningless.
6. Ayer's position is more radical: he does not say we cannot know whether the Absolute exists; he says the sentence 'The Absolute exists' fails to say anything at all.

Heidegger, Substance Metaphysics, and Philosophy's New Role

1. The attack extends to all substance metaphysics (theories about what the universe is ultimately made of, or what really exists at its most basic level). Claims about ultimate reality are all equally meaningless on Ayer's account because they transcend possible verification.
   1. Materialist: "everything is matter".
   2. Idealist: "everything is mind".
   3. Dualist: reality has two fundamental kinds.
2. Heidegger's existential ontology receives similar treatment. Ayer regards statements such as "Nothing noths" (Das Nichts nichtet) as paradigmatic examples of metaphysical nonsense disguised by grammatical form.
3. The word "nothing" functions as a noun, creating the illusion of reference, when it is merely a logical operator.
4. Ayer acknowledges that metaphysicians are often intelligent thinkers. Their error is not stupidity but a systematic misunderstanding of language.
5. They mistake the grammatical possibility of forming sentences for the logical possibility of expressing propositions.
6. This wholesale dismissal raises an immediate question: if metaphysics is meaningless, what remains for philosophy to do? Ayer's answer is that philosophy's legitimate function is logical analysis: clarifying concepts and methods used in the sciences.
7. Philosophy becomes a second-order activity analysing language rather than investigating reality directly.

Philosophy of Religion Under Attack

1. Ayer's elimination of metaphysics has particularly devastating consequences for religion. The verification principle renders all statements about a transcendent God meaningless, because a being beyond the empirical world is by definition beyond possible verification.
2. Ayer distinguishes his position from both theism and atheism. The theist claims 'God exists'; the atheist claims 'God does not exist.' Ayer rejects both as equally meaningless, since neither is verifiable.
3. If God's existence is not an empirical hypothesis, neither its affirmation nor denial expresses a genuine proposition. This position is known as theological non-cognitivism (the view that religious language does not make cognitive claims that could be true or false at all).
4. This move undermines the entire tradition of natural theology (using reason and observation to prove God's existence, without relying on scripture). The three classical arguments all fail not because their reasoning is flawed but because their conclusions are cognitively empty.