“…there is nothing good or bad, but thinking makes it so” (II, ii, 250)
Hamlet is saying more than he realizes here. He tells this to Rosencrantz and Guildenstern, but fails to grasp just what he has said.
Hamelet’s predicament is one rife with “bad”, but Hamlet fails to see the truth in his own words and realize that his own thoughts are leading him astray. Whether or not he is indeed playing mad, putting on an “antic disposition”, Hamlet’s own thinking leading up to the third act is doomed to lead him down a path upon which he will only encounter more “bad”.