In the provided lines from "Macbeth," Shakespeare uses the image of the dagger to represent Macbeth's inner turmoil and psychological state. The sight of the dagger, which he acknowledges is not physically present, can be interpreted in multiple ways. The two correct interpretations that 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 Macbeth's deteriorating mental state as he grapples with his ambition and the violent act he is contemplating.
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Macbeth’s guilt for thinking about killing the king has triggered its appearance. - The hallucination of the dagger symbolizes Macbeth's anxiety and moral conflict regarding the murder he is contemplating, reflecting his guilt and the psychological impact of his ambition.
These interpretations connect to the themes of ambition, guilt, and madness present in the play.