My father as he slept, I had done't." Later in the scene, she says, "To alter favor ever is to fear." When Macbeth returns home, he is still hesitant about killing the king, and he states that the "enterprise, / Whereon this builds, turns now to use of thoughts, / Rather than deeds."
Lady Macbeth attempts to guilt him into going through with the murder by saying, "When you durst do it, then you were a man; / And, to be more than what you were, you would / Be so much more the man." She then states that she would murder her own babe if she made a vow, calling Macbeth a "coward" for not having the same resolve as her. In response, Macbeth says, "I dare do all that may become a man. / Who dares do more is none."
Finally, Lady Macbeth challenges him again, asserting that he lacks any genuine masculinity if he will not murder Duncan. Goaded by her words, Macbeth agrees to proceed with the plan. When Lady Macbeth says that she will take over the situation and drug the royal chamberlains, he responds,
"Bring forth men-children only; /For thy undaunted mettle should compose
Nothing but males."