How does lady Macbeth persuade her husbands to go through with the plan?

Expert Answers
amymc eNotes educator| Certified Educator

Lady Macbeth basically uses a four-pronged approach to wearing down the last bit of morality in her husband.

First, she asks him why he broke the promise to her?  Of course, Macbeth never did actually promise her; he just sent her a letter detailing the prophecies of the witches.  However, this does not seem to matter.  Further more, she notes that he must not lover her, saying "From this time / Such I account thy lov." (I,vii).

Next, she asks if he is a coward.  Typically, men do not like to being called scared, especially visious warriors like Macbeth.  She claims

Wouldst thou have that
Which thou esteem'st the ornament of life,
And live a coward in thine own esteem,
Letting 'I dare not' wait upon 'I would,'
Like the poor cat i' the adage? (I,vii)

Finally, she tells him that she would do if for him, if she had promised.  She uses the gory image of bashing a baby's head, saying she would if she had so sworn.

All in all, Macbeth is no match for his wife and gives in.