In Macbeth, what are some quotations that express Macbeth's betrayal of Banquo?

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teachertaylor eNotes educator| Certified Educator

At the beginning of Act 3 in Macbeth, Macbeth expresses his fears in Banquo.  The witches' prophecy has already come true in full for Macbeth, and now he fears that the witches' prophecy for Banquo will also come true.  In his soliloquy in Act 3 Scene 1, Macbeth admits that Banquo has a "royalty of nature" that prevents him from acting rashly, selfishly, and unwisely.  Macbeth knows that Banquo is a good man, but this does not prevent Macbeth from deciding to plot against him.  By the end of his soliloquy, Macbeth wishes to change the course of fate by having Banquo and Fleance murdered as they ride from Inverness that night.  Here, Macbeth betrays Banquo who is a good man and a loyal soldier so that he can be secure on the throne and continue to follow his ambitions.