Wittg.–

     When we say “A believes p”, this sounds, it is true, as if here we could substitute a proper name for “p”; but we can see that here a sense, not a meaning, is concerned, if we say “A believes that ‘p’ is true”; & in order to make the direction of p even more explicit, we might say “A believes that ‘p’ is true & ‘not-p’ is false”. Here the bi-polarity of p is expressed, & it seems that we shall only be able to express the proposition “A believes p” correctly by the ab-notation; say by making “A” have a relation to the poles “a” & “b” of a-p-b. The epistemological questions concerning the nature of judgment & belief cannot be solved without a correct apprehension of the form of the proposition.