" I go, and it is done: the bell invites me. Hear it not, Duncan, for it is a knell That summons thee to heaven, or to hell" Act 2, scene 1, lines 3

In this quote Macbeth is on his way to kill Duncan. Macbeth is having trouble with the idea of killing his King. Macbeth hears the bell ring and prayes that Duncan dosent hear it. He tells Duncan in his mind that the bell calls for his death. Macbeth kills him. This quote shows that in this part of the play Macbeth is no longer struggling with the thought of killing his king, but he has alredy done so.