Shakespeare introduces Macbeth's conflicted state of mind to show them how his emotions are contradictory and how he has inconsistent feelings all the time.
We can arrive at this answer because:
This Macbeth duality is what Shakespeare explores to show how Macbeth's state of mind is conflicted. This is because while he fears suffering for the crime he committed, he feels grateful for having committed, at the same time he feels brave, he feels coward and at the same time, he shows himself to be decisive and fickle.
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