Macbeth needs to know more information about the future. So far everything that they told him has come true. He was Thane of Glamis, he became Thane of Cawdor, and now he is the king. However, when Banquo's ghost appears--and only Macbeth can see it--he remembers the prophesy that Banquo's sons will be kings as well. Macbeth needs to know what is coming so he can prepare for either Fleance, or to see what is in his future. He is becoming a killing machine at this point, and his famous line to his wife in Act III, Scene IV is "It will have blood; they say, blood will have blood." Macbeth is very concerned that he will lose his crown and he wants to make sure he knows what is to come, which is why he goes again to the witches.
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