Hamlet reveals that humans are fundamentally limited in the scope of their knowledge. This is dramatized in many ways, from Hamlet's famous soliloquiy in which he contemplates what he might do if he were not afraid of what lay in 'the undiscovered country' of the afterlife, to Polonius ridiculous recitation of useless advice. Who knows truth? Only the the ghost of Hamlet's slain father. And then, when Hamlet attempts to divine truth by putting on his play within a play, what is the result of this attempt to attain knowledge? Death and more death.