I think that given the fact that the fortune telling of the witches has come to pass it would be a good thing for Macbeth to listen to the witches.
After Ross had brought in the news that Macbeth had been made the Thane of Cawdor, Macbeth remembered the saying of witches then he realized that they were telling the truth.
He was given this title because the person that held the post had been executed for treasonable reasons.
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