“What, can the devil speak true?”

• he expresses shock that the Witches’ prophecy, that Macbeth would become Thane of Cawdor, has come to pass. 
• referring to the Witches as “the devil,” Banquo immediately associates them with evil and deception.
• highlighting the play’s strong connection between the supernatural and moral corruption. 
• shows his disbelief and growing concern, as he realises that even evil forces can tell the truth, but with harmful intent. 
• uses this moment to deepen the theme of appearance versus reality, truth is not always trustworthy when it comes from a dark source.
• Banquo’s reaction contrasts with Macbeth’s excitement.
• showing that Banquo remains sceptical and morally cautious, while Macbeth begins to fall under the Witches’ influence.
• theme of temptation, suggesting that evil often begins by offering something desirable and true, before leading to destruction.
• Through Banquo’s questioning, Shakespeare warns the audience about the seductive and dangerous power of partial truths spoken by corrupt forces.