At the beginning of the play, we learn that Macbeth is courageous and unrelenting, as evidenced in the following quote from a sergeant who reports on the battle in Act l, Scene 2:
...but all's too weak:
For brave Macbeth--well he deserves that name--
Disdaining fortune, with his brandish'd steel,
Which smoked with bloody execution,
Like valour's minion carved out his passage
Macbeth is ruthless, as illustrated later in the same speech:
Till he faced the slave;
Which ne'er shook hands, nor bade farewell to him,
Till he unseam'd him from the nave to the chaps,
And fix'd his head upon our battlements.
This ruthlessness is further illustrated when Macbeth kills his king, has Banquo assassinated, and has Macduff's entire family wiped out.
Macbeth is gullible because he readily believes the witches ' prophecies and does not question the veracity of their predictions. This is best illustrated by the fact that they tell him, through apparitions, that he will be invincible and will not be defeated until Birnam...
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