In this scene, Lady Macbeth shows how ambitious she is—perhaps even moreso than her husband. She is so excited and overwrought by the witches' prophecy that Macbeth will be king that she wants to murder Duncan immediately. Her only fears are that Macbeth is too kind-hearted (and therefore not up to the task) and that she herself will be overtaken with compassionate scruples. She wants to kill all the human feeling in both of them, so they can steel themselves to murder a king who has treated them well.
Lady Macbeth calls on dark spirits to help make her cruel and remorseless. She doesn't want any thoughts of heaven to keep her from acting. She calls out to the dark spirits,
Come to my woman’s breasts,
And take my milk for gall, you murd'ring ministers . . .
Lady Macbeth also shows that she is prone to act before thinking through the consequences of her actions: it never occurs to her that her conscience might have a mind of its own and come back later to haunt her.
In this scene, Lady Macbeth...
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