First, when Banquo and Macbeth receive the Weird Sisters' "prophecies," Banquo's response is characteristically artless. Although Macbeth seems to believe them without question, and is further convinced by the fact that their first statement -- that he will become Thane of Cawdor -- has come true, Banquo is open about his concerns. He says,
But 'tis strangeAnd oftentimes, to win us to our harm,The instruments of darkness tell us truths,Win us with honest trifles, to betray 'sIn deepest consequence. -- (1.3.134-138)
He worries that the Weird Sisters may be attempting to do the men harm by telling them the truth about something small so that they will believe in the inevitability of something bigger. Specifically, they might have told Macbeth the truth about becoming Thane of Cawdor just so he would believe that he would also become king; then, if this belief ignites Macbeth's ambition, it could lead him to do things that would be harmful to himself or others. Banquo openly shares his...
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