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Criteria/Cavell: the skeptic is right with the assumption that to the knowledge that someone has pain belongs more than just the presence of criteria.
Criteria can determine whether a behavior expresses more pain than pleasure, but not whether it is a genuine pain instead of a pretended one.
Wittgenstein/Cavell: both deny, contrary to most other philosophers, that conformity with criteria (a sign of intelligible speech) can be justified by reference to universals.
Die Unheimlichkeit des Gewöhnlichen Frankfurt 2002