Duncan's Trust and Betrayal
Ever trusted someone completely only to be let down? That's exactly what's happened to King Duncan with the original Thane of Cawdor, who's just been executed for treason.
Malcolm reports that Cawdor died nobly, confessing his crimes and begging forgiveness. Duncan feels foolish for trusting him, admitting "There's no art to find the mind's construction in the face" - basically, you can't read someone's true intentions just by looking at them. This is dramatic irony at its finest, since Duncan is about to make the same mistake with Macbeth.
When Macbeth and Banquo arrive, Duncan showers them with praise and gratitude. He's genuinely grateful for their service in battle and wants to reward them properly. Macbeth responds with what sounds like perfect loyalty, saying his duty "pays itself" and that serving Duncan is its own reward.
Key insight: Duncan's inability to judge character becomes his tragic flaw - he keeps trusting people who will ultimately betray him.
