Throughout the play, Macbeth is shown to be a man who is driven by his desire for power. He is willing to do anything to achieve his goals, even if it means murdering his own king. After he is crowned king, Macbeth becomes paranoid and guilt-ridden, and he begins to see visions of the people he has killed. He eventually descends into madness and is killed by Macduff.
Macbeth's story is a cautionary tale about the dangers of ambition. It shows how unchecked ambition can lead to violence, guilt, and madness.