Banquo's monologue

In Act 3 Banquo has his own monologue. He suspects that Macbeth was the one who killed king Duncan, just like the witches promised. "King, Cawdor, Glamis, all as the Weird Women promised." The reader might also think that Banquo knows the witches cursed Macbeth. Macbeths fate is to become king but its the checks he makes to make his fate come faster. This is where the theme fate vs free will plays apart in the Scottish play.  The reader also has a feeling that his monologue foreshadows Banquo's  

Banquo seems confused because his children should be next in throne. "But that myself should be the root and father of many kings." False appearance plays a huge role in this scene. Banquo knows Macbeth is faking his innocence. "And set me up in hope? But hush, no more." This quote means Banquo will stop the madness that Macbeth is causing.