Is there really a strong distinction between understanding what a proposition

Is there really a strong distinction between understanding what a proposition

Is there really a strong distinction between understanding what a proposition means and believing or disbelieving it? It strikes me that if I believe a proposition while my opponent does not, one way to explain the disagreement is to say that he misunderstands either that proposition or some related proposition. And so if we really did both understand all of the propositions in question, we'd have to agree about them as well.

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