The thesis I shall defend is this. Many philosophical arguments which involve an appeal to ordinary linguistic usage turn out themselves to use key terms in a non-ordinary way, and to have no point unless they do so. They therefore use terms in a way which, if their appeal is justified, is unjustified. I shall first illustrate this thesis with some examples. Then I shall try to show why in general the situation exists.

The thesis I shall defend is this. Many philosophical arguments which involve an appeal to ordinary linguistic usage turn out themselves to use key terms in a non-ordinary way, and to have no point unless they do so. They therefore use terms in a way which, if their appeal is justified, is unjustified. I shall first illustrate this thesis with some examples. Then I shall try to show why in general the situation exists.