It would be great to have an explanation and some quotes to justify it.
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There are quite a few things that happen in act one. I would say the general atmosphere is pensive and full of conflicting emotion. Macbeth spends much of the time obsessing about murdering the king. He wants to be king but his motivation began with the witches suggestions: and witches are evil!
(Duncan's Death) ...Whose horrid image doth unfix my hair. And make my seated heart knock at my ribs,. Against the use of nature? Present fears. Are less than horrible imaginings. Act 1