Hamlet vows to affect madness — puts "an antic disposition on" — to wear a mask that will enable him to observe the interactions in the castle, but finds himself more confused than ever. In his persistent confusion, he questions the Ghost's trustworthiness. What if the Ghost is not a true spirit, but rather an agent of the devil sent to tempt him? What if killing Claudius results in Hamlet's having to relive his memories for all eternity? Hamlet agonizes over what he perceives as his cowardice because he cannot stop himself from thinking. Words immobilize Hamlet, but the world he lives in prizes action.