Open-question argument

Philosophical argument

The open-question argument is a philosophical argument put forward by British philosopher G. E. Moore in §13 of Principia Ethica (1903), to refute the equating of the property of goodness with some non-moral property, X, whether natural or supernatural. That is, Moore's argument attempts to show that no moral property is identical to a natural property. The argument takes the form of a syllogism modus tollens:Premise 1: If X is good by definition, then the question "Is it true that X is good?" is meaningless.Premise 2: The question "Is it true that X is good?" is not meaningless.Conclusion: X is not good.

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