Hands are a recurring motif in Macbeth. But you can't just write "hands are a recurring motif in Macbeth" in your exam, because that's not an insight.
So what do hands symbolise?
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(4.1) MACBETH: The very firstlings of my heart shall be / The firstlings of my hand.
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(1.4) MACBETH: The eye wink at the hand.
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(3.2) MACBETH: Come, seeling night,
Scarf up the tender eye of pitiful day;
And with thy bloody and invisible hand
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Hands are a symbol of guilt that you might think you can wash off but which stays with you:
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In Act 5, LM is now scrubbing her hands to clean off her guilt, and Macbeth still has "his secret murders sticking on his hands."
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No coincidence, then, that LADY MACBETH's final message to Macbeth - "Give me your hand. What's / Done cannot be undone" (5.1) maintains the symbolism of hands as the repositries of evil deeds.
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And any apparitions you see -- as in Act 4 -- might be holding something significant in their hands. Just saying.
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