It is interesting to consider an objection to this: What if I said, “I believe it will rain” (meaning what I say) and someone wanted to explain to a Frenchman who doesn't understand English what it was I believed. Then, you might say, if all that happened when I believed what I did was that I said the sentence, the Frenchman ought to know what I believe if you tell him the exact words I used, or say, “Il croit ‘It will rain’”. Now it is clear that this will not tell him what I believe and consequently, you might say, we failed to convey just that to him which was essential, my real mental act of believing. ‒ ‒ But the answer is that even if my words had been accompanied by
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all sorts of experiences, and if we could have transmitted these experiences to the Frenchman, he would still not have known what I believed. For “knowing what I believe” just doesn't mean: feel what I do just while I say it; just as knowing what I intend with this move in our game of chess doesn't mean knowing my exact state of mind while I'm making the move. Though, at the same time, in certain cases, knowing this state of mind might furnish you with very exact information about my intention.