What are the objects of the so-called ‘propositional attitudes’ — belief, desire, and the like? One of the best-known accounts holds them to be sentences. According to this account — which I shall call the ‘linguistic theory’ — an analysis of the logical form of a sentence like
will see the word ‘that’ as a hidden pair of quotation marks: except for niceties of idiom, (1) might be written
(2) asserts that a certain relation, the ‘believes’-relation, holds between John and the sentence ‘the moon is round’.