When a statement fails to satisfy itself…

Philosopher J. P. Moreland defines self-refutation: “When a statement fails to satisfy itself (i.e., to conform to its own criteria of validity or acceptability), it is self-refuting…. Consider some examples. ‘I cannot say a word in English’ is self-refuting when uttered in English. ‘I do not exist’ is self-refuting, for one must exist to utter it. The claim ‘there are no truths’ is self-refuting. If it is false, then it is false. But if it is true, then it is false as well, for in that case there would be no truths, including the statement itself.

Greg Koukl and Francis Beckwith, from Relativism: Feet Firmly Planted in Mid-Air, p. 82

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