 Now we can say what the “diagonal proposition” is. It is simply the proposition represented by the diagonal from the upper left to the lower right of the above table. This represents the truth value Oscar’s belief has, for any context, in the world of that context. The truth conditions this gives us are different from any of the three broad contents Oscar’s belief might have depending on his context. But arguably they also give a better account of his narrow content than any of the horizontal propositions does. Unaware as he is of the chemical structure of water, Oscar has no direct access to which possible context is his actual context, and thus in a sense does not know what broad content his thoughts have. He also does not know for certain what liquid the beaker contains. What he does know is that if his ‘water’-thoughts are anchored in XYZ and the substance in the glass is also XYZ, then his belief is true; and if his ‘water’-thoughts are anchored in H2O and the substance in the glass is also H2O, then his belief is true; and if his ‘water’-thoughts are anchored in H2O and the substance in the glass is H2SO4, then his belief is false; and so on. In short, although his internal state does not suffice to determine any of the horizontal propositions, it does suffice to determine the diagonal proposition, which therefore seems to do a better job of capturing Oscar’s state of mind than the horizontal propositions do.