This document analyzes several themes in Shakespeare's play Macbeth: 1) Ambition plays a key role in Macbeth's decision to murder Duncan and become king after the witches' prophecy. 2) Supernatural elements like the witches' prophecies are central to the plot and cause Macbeth's ambition. 3) Violence pervades the play as characters use it to fulfill their goals and prove their masculinity, like Macbeth's murder of Duncan.