"Put in a nut-shell, my thesis amounts to this. The repeated attempts made by Rudolf Carnap to show that the demarcation between science and metaphysics coincides with that between sense and nonsense have failed. The reason is that the positivistic concept of 'meaning' or 'sense' (or of verifiability, or of inductive confirmability, etc.) is inappropriate for achieving this demarcation — simply because metaphysics need not be meaningless even though it is not science. In all its variations demarcation by meaninglessness has tended to be at the same time too narrow and too wide: as against all intentions and all claims, it has tended to exclude scientific theories as meaningless, while failing to exclude even that part of metaphysics which is known as 'rational theology'."
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HumanistsPhilosophers from the United KingdomPhilosophers from AustriaLogicians from AustriaLogicians from the United Kingdom
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Ch 11. "The Demarcation between Science and Metaphysics." (Summary, p. 253)
https://en.wikiquote.org/wiki/Karl_Popper
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