Wittgenstein on Believing that p

The outlines of Wittgenstein"s conception of propositions
can be sketched by means of the following four or five
points. First, in 1913 Wittgenstein focuses on whatever it is
that judgments have in common that allows them to depict
a sense and express a thought. In so doing Wittgenstein is
pressing to find a sense or proposition – what is believed
in -- of concern to logic and independent of psychological
conditions like judging, asserting, and negating.