Here's a thesis statement you can use:
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Act 1 Sc 3: BANQUO -- "To win us to our harm / The instruments of darkness tell us truths."
In other words, we can't be sure whether the witches' prophecy is really FATE, or whether it's a devilish trick to lead Macbeth into evil.
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1.3 "If change will have me king, why, chance may crown me / Without my stir."
In other words, hey, if I'm fated to be King maybe I just need to let it happen without taking action.
But...
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4.1 "And yet I'll make assurance double sure / and take a bond of fate."
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5.8: "I bear a charmed life, which must not yield / To one of woman born."
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- we can never be sure if the witches were really speaking Macbeth's "fate" or influencing him
- Shakespeare shows that Fate isn't responsible for the evil of ambition
- in the end, Macbeth's belief in his own fate leads to suffering and tragedy.
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CONTEXTUALLY, ideas about fate and free will in Shakespeare's time are CONFUSING AF.
The best you can do in an exam would be something like this:
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Goodnight Thanes.
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