Macbeth Act II: Macbeth's Struggle Between Right and Wrong

Macbeth in Act II is struggling with a very guilty conscience, one that is making him feel as if he is going insane. In Act II, scene one, lines 33 to 41, Macbeth describes his confusion as to whether or not the dagger Lady Macbeth has left out for him is an actual dagger, or one invented in his mind. When he says “Or art thou but A dagger of the mind, a false creation, proceeding from the heat-oppressed brain?”  indicates that he feels weighed down by his conscience. He doesn't actually want to kill King Duncan, but pressure from Lady Macbeth has brought “heat” to his mind, making it hard for him to stand firm in his own decisions. The choice in diction to use the word “oppressed” is very interesting, because it paints a vivid picture of a distressed Macbeth, who is literally a slave in his own mind. His fluctuation between wanting to do the right thing and trying to appease Lady Macbeth has left him feeling hopeless. He also struggles with his own hunger for power, because that hunger is so strong that he is willing to kill for it. But there is also a niggle in his mind that knows how unjust it would be to kill the man who has given him so much. I believe this little part of him is what is causing him to feel like he is going insane, but Macbeth eventually kills Duncan, and frames other people for it.