Act 1, Scene 4
After the previous thane of cawdor is executed from helping the norweigeins, Malcom (duncans eldest son) is name Prince of Cumberland. Macbeth then realised that he isn’t next in line for the throne and that for him to become king he must find a way to over throw Malcom. “For in my way it lies. Stars, hide your fires! Let not light see my black and deep desires;” This quote is showing that Macbeth is plotting to get rid of Malcom and he doesn’t want anyone to see or know about his plan.