Macbeth begins to have second thoughts about murdering Duncan. He knows Duncan has been good to him and also wants to bask in his favor. However, Lady Macbeth wants to seize this moment, when Duncan is a guest under their roof, to do the job. She also doesn't want Macbeth to lose his resolve.
Lady Macbeth knows her husband and how to manipulate him. She does so by appealing to his masculinity. She says that if she had promised to murder somebody, even to the point of dashing her baby's brains out, she would do it. Macbeth is impressed at her hardness and says he hopes she is the mother of sons. Because he does not want to be emasculated in her eyes, Macbeth agrees to go through with a plan he knows will lead to more and more bloodshed. He tries to explain this to her. He tells her there will be no going back once he heads down the path of murdering a king. Lady Macbeth is unmoved, and Macbeth kills Duncan.
It is interesting that Macbeth has a clearer idea than his wife of what the murder...
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