We haven't found a truth-theory which could serve as a theory of understanding in the strong sense. The most plausible theory, Higginbotham's version of the conditional view, requires for understanding an indexical utterance knowledge about the referential act with which the utterance is conventionally correlated. But it does not require thinking the specific kind of thought in which understanding in the strong sense consists. This constitutes a good reason for the rejection of the idea that a truth-theory can serve as a theory of propositional content. At best such a theory is a theory of linguistic meaning.
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