 Proponents of sententialism are well aware of the problem. But it is much less obvious that they have succeeded in solving it. Carnap (see Carnap 1947 [1958], supplement C) responds to Church’s objection by claiming that the proposal need not require that the agent believe-true the very sentence contained in the complement clause, but only some sentence or other that bears some relation (Carnap calls it ‘B’) to the sentence the ascriber uses. But this relation can’t simply be left unanalyzed. And one cannot analyze it in terms of believing-true a sentence that expressing the same proposition or worse still believing the proposition expressed by the embedded sentence, on pains of reverting to the thesis of propositionalism that the theory was designed to avoid.