What was the witches' role in Macbeth?

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…He forgets the warning to 'Beware MacDuff,' and instead, focuses on the aspects that make him feel over-confident. In conclusion, although the witches did have the power to accurately predict significant events in MacBeth's life, the actual 'carrying out' of those prophecies was undertaken by MacBeth (and his wife). They may have attained their status without their illegal actions, but, by acting on their own prerogative, both MacBeth and his wife carry full blame