King Duncan says “There’s no art to find the mind’s construction in the face. He was a gentleman on whom I built an absolute trust” (Act 1, Scene 4). Duncan was referring to the (now-executed) Thane of Cawdor, whom he trusted and who betrayed that trust. But then Duncan immediately does exactly the same thing with Macbeth — trusts him completely. And Macbeth, as we know, is about to betray Duncan’s trust, in the worst way possible. Is Duncan naive?