After getting the idea that he can become king, Macbeth murders his king, his guests, and even his friends and their families in order to gain the crown. The witches' predictions appear to spur an ambition that's already there inside him. Lady Macbeth adds fuel to the fire.
"The prince of Cumberland: That is a step / On which I must fall down, or else o'er-leap, / For in my way it lies. Stars, hide your fires; / Let not light see my black and deep desires, / The eye wink at the hand. Yet let that be, / Which the eye fears, when it is done, to see." (Act I, Scene 4)
Changeable
Macbeth is uncertain whether he can kill Duncan or not. He wants to remain loyal to his friends and his king. Lady Macbeth helps to persuade him to move forward with the plan.
"We will proceed no further in this business. / He hath honoured me of late, and I have bought / Golden opinions from all sorts of people, / Which would be worn now in their newest gloss, / Not cast aside so soon. I am settled and bend up / Each corporeal agent to this terrible feat." (Act I, Scene 7)
Guilty conscience
Macbeth is tormented by his terrible deeds. He doesn't seem able to stop himself, though.
"(seeing the GHOST) Avaunt, and quit my sight! Let the earth hide thee! / Thy bones are marrowless, thy blood is cold; / Thou hast no speculation in those eyes / Which thou dost glare with." (Act III, Scene 4)
Brave
Macbeth is a strong and courageous warrior who leads Duncan's troops to victory. At the end he stands up to Macduff.
"For brave Macbeth-- well he deserves that name -- / Disdaining fortune, with his brandished steel, / Which smoked with bloody execution, / Like Valour's minion carved out his passage / Till he faced the slave, Which ne'er shook hands, nor bade farewell to him, / Till he unseamed him from the nave to th'chaps, / And fixed his head upon our battlements." (Act I, Scene 2)
