What are Macbeths visions and hallucinations and how does it play a role in the development of his character??
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Remember that Macbeth's visions don't cause his insanity. His insanity causes his illusions.
He sees a dagger. He also cannot sleep. His guilt is causing some mental breakdown. So, unable to think for himself, he turns to the witches (dumb choice, wouldn't you say?) for thoughts.