Macbeth is tormented by an awareness of the wickedness of what he is doing. Endowed with a clear-eyed grasp of the difference between good and evil, he chooses evil, even though the choice mystifies and sickens him.
No one else in the play has a moral sensibility so intense or so visionary, no one else imagines so vividly the forces that lie beyond the ordinary and familiar horizon of human experience.
Macbeth
