There can be many themes in Macbeth, but I find that the theme of power and greed not going without consequences seems to be the most powerful theme. This is basically stating that wanting power and having greed can overcome you sometimes, but gaining power unfairly because of greed will not go without consequences. In Macbeth, Macbeth and Lady Macbeth want the positions of queen and king because of the three witches' prophecies and their own greediness. They murder King Duncan and frame his chamberlains to get this power. They both end up having their guilt overcome them, yet continue to murder only to cover up what they had already done. Eventually, Lady Macbeth kills herself and Macbeth is beheaded by Macduff. This proving that their greed and need for power overcame them, and guilt and consequences caught up with them.