Arthur Brook, a medical officer at Craiglockhart War Hospital, suggested that he deal with the "ghosts of the mind", as he does in "Dulce et Decorum est", with the "dripping , suffocates, drowns a man who torments his 'dreams'. He exposes, (and thus) liberates himself from, the anger and frustration felt by many who have been lied to. He can only express this through poetry as he writes: "All that a poet can do today is to warn." This is why the true poet must be sincere." James Campbell suggests that this forces him into an "epistemological trap" since the reader can never truly understand his experiences; so we must ask whether his poem is truthful. Owen uses 'Dulce et Decorum est' to show the reality of war, but fails to fully justify, through words, his bleak reality of war.