In analyzing Shakespeare's use of the dagger in these lines from "Macbeth," the two interpretations that can be used to explain its use are:
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Macbeth’s sight of the dagger, which is not actually there, indicates his insanity. – This interpretation highlights how the dagger symbolizes Macbeth's deteriorating mental state, as it is a manifestation of his guilt and psychological turmoil.
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Macbeth’s guilt for thinking about killing the king has triggered its appearance. – This interpretation suggests that the dagger represents Macbeth’s inner conflict and guilt surrounding his ambition to murder King Duncan, signifying the moral and psychological consequences of his thoughts and actions.
These interpretations align with the themes of guilt, ambition, and madness prevalent throughout the play.