Just before the soliloquy in Act 2 Scene 1, Macbeth has doubts about killing Duncan. He tells himself that for the action to be done, it will have to be done quickly. ("If it was done when it was done, then it would be well if it was done quickly.") Lady Macbeth then enters the scene and insists that Macbeth continue with the murder of Duncan because otherwise he is a coward . Macbeth is aware that this is a bad sin as he declares, “I dare to do anything that becomes a man.” This statement shows that Macbeth thinks that killing Duncan will only make him a beast. Lady Macbeth then undermines Macbeth by telling him "Screw your courage to the end", this simply means that Macbeth should be as brave as he could be. Nevertheless, Macbeth decides to carry out the terrible act of killing his king and faithful friend Duncan. In the soliloquy of Act 2, Scene 1, Macbeth is about to murder the noble King Duncan when he visualizes a dagger in front of him which he actually questions whether it is there or not. He knows the dagger isn't really there, but still ...