Macbeth’s Ambition Political ambition undermines man’s loyalty. In the play, Macbeth decides to kill his king because of his ambition for position. At the beginning of the play, he portrays himself as a noble person. He fights in the battle against Norway and proves his loyalty; however, as soon as the witches prophesize that Macbeth “shall be king hereafter” (1.3.53), he is not longer trustworthy. Ambition for power starts creeping into his head. After Macbeth’s internal conflict over whether or not to kill Duncan, he decides to do it quickly (1.7.3) in order to hasten the predictions. He decides to kill the king because he wants to extend his power all over the