[A]s Wittgenstein's later work (especially the
Philosophical
Investigations) shows, no proposition or set of propositions
wholly contains their meaning. An understanding of the meaning of a
proposition always depends upon other, external, factors. We
understand one another ... because we share a common set of
assumptions with which to interpret our communications. Lacking such a
mutual basis we must seek it out and fail to find it before we can
dismiss propositions under such a rubric as 'schizophrenese'.