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.