Macbeth Fate and free will:

ROSS 'Gainst nature still! Thriftless ambition, that wilt ravin up Thine own life's means! Then 'tis most like The sovereignty will fall upon Macbeth. (2.4.6)

ambition is to blame for Duncan's murder. Here, he accuses Duncan's kids of going "'gainst nature" and killing their own father—but Macbeth is the one to watch out for. Our question: is Macbeth going against nature, too, by killing the king? Is ambition of any kind unnatural?