Macbeth and Duncan were once very close friends, but Macbeth's desires had lowered himself as a man to such a low level, that it would only be a matter of time before the guilt would surely arise from the depths of his inner soul. ... The desire for power can conflict between two very close friends and once this takes place, a friendship that had once thought that would have lasted for eternity, would be torn and shredded into two miniature pieces. ... Maybe it is because Macbeth's true self shines through his outer coat and reveals his inner most desires. ...