the scene where he drinks the potion from the witches to see more of the prophecy and to answer some of his questions
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Macbeth is now dedicated to completing the path he started down when he killed Duncan. Now, however, he does not need any convincing. He is convinced that the witches and their predictions will guide him through the rest of his life and thus the rest of the play. He now has no morals and no compunction about anything he does.