Macbeth is both excited and fearful after hearing the witches predictions about his future because the witches told Macbeth that he would be king, and he is worried about his role in making the prediction come true.
Even though i walk through the valley of the shadow of death, i will fear no evil, for you are with me; your rod and your staff, they comfort me
psalm 23:4
exemplify the character of the struggle between the righteous and the rest
It is "poison"
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Your answer would be "Enough"