In analyzing Shakespeare's use of the dagger in these lines, the two correct interpretations are:
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Macbeth's sight of the dagger which is not actually there indicates his insanity.
This interpretation highlights Macbeth's psychological descent. The vision of the dagger represents his unstable mind and the effects of his ambition and guilt. It suggests that he is losing touch with reality, as he perceives something that is not there, which signifies his mental unraveling. -
Macbeth's guilt for thinking about killing the king has triggered its appearance.
This interpretation points to the connection between Macbeth's guilt and the manifestation of the dagger. The dagger symbolizes his inner turmoil and the conflict between his ambition and moral hesitation. It reveals how his contemplation of murder weighs heavily on his conscience, leading to a hallucinatory experience.
These interpretations effectively underscore the themes of ambition, guilt, and madness in Macbeth's character arc.