But suppose we take the noun 'truth': here is a case where the disagreements between different theorists have largely turned on whether they interpreted this as a name of a substance, of a quality, or of a relation.
But surely, speaking carefully, we do not sense 'red' and 'blue' any more than 'resemblance' (or 'qualities' any more than 'relations'): we sense something of which we might say, if we wished to talk about it, that 'this is red.'
The beginning of sense, not to say wisdom, is to realize that 'doing an action,' as used in philosophy, is a highly abstract expression--it is a stand-in used in the place of any (or almost any?) verb with a personal subject, in the same sort of way that 'thing' is a stand-in for anynoun substantive, and 'quality' a stand-in for the adjective.
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