Macbeth is filled with great hubris. Lady Macbeth plays on this pride when she challenges his masculinity. She goads him by saying, When you durst do it, then you were a man / [. . .], you would / be so much more the man. (Shakespeare, Macbeth. 1.7.49-51). Lady Macbeth tells her husband to kill Duncan to prove that he is a man, and states how much more of a man he will be as king. Eugene M. Waith states in his criticism Manhood and Valor in Macbeth, that the pangs of Macbeths conscience [. . .] are no more than effeminate, childish fears to Lady Macbeth.(64) She has a great deal of power over Macbeth; this power is the mere truth that she possesses more of a manly quality that he himself does.
Macbeth is ambitious enough to want to become king, but would not think of murdering Duncan. Because Lady Macbeth knows this, she understands the necessity to push Macbeth into performing the deed. She does this by questioning his love for her. What beast wast then / that made you break this enterprise to me?/ [. . .] I would, while it was smiling in my face, / have plucked my nipple from his boneless gums a/ nd dashed the brains out, had I sworn so as you / have done to this. (Mac. 1. 7. 47-48. 55-58) In saying this, Lady Macbeth proves her devotion to her lord and asks him to do the same. Lady Macbeth tells him that his love is worth nothing if he refuses to go through with the plan, [. . .] saying that his love is as accountable as his indecisiveness. (Macbeth and Lady Macbeth Switch Roles. www.planetpapers.com) Macbeth wants his wife to love and trust him, so he follows through with their plan.
Macbeth is brave when it comes to thought, but when it comes to action he is somewhat of a moral coward. Lady Macbeth bullies her husband into the action that will gain them the throne. The final way she badgers Macbeth is by deprecating his bravery. We fail! / But screw your courage to the sticking-place / and well not fail. (Mac. 1.7. 59-61) Macbeth views himself as the epitome of bravery and upon hearing these words from the woman he loves, he succumbs to their ambitions.
Lady Macbeth taunts him for his cowardice, under the weight of her reproaches of cowardice he has dared do more, and has become less [. . .] (Brooks. 45). Throughout the Renaissance, the idea that to be courageous is to be a man prevails. At the beginning of the play, Macbeth represents the ideal Elizabethan hero; therefore, bravery is an important character attribute. Lady Macbeths ruthlessness and manipulation of Macbeth causes him to defy his true principles and to murder Duncan.
From the beginning of Act One Scene Five, until after the murder of Duncan, it is evident that Lady Macbeth manipulates and convinces Macbeth to do evil. Lady Macbeth knew that he would never go through with it alone, she realizes that he holds too much of the milk of human kindness (Mac. 1.5.12) to ever complete such an appalling feat. Lady Macbeth uses persuasion to coerce her husband. Had she not mocked his masculinity, challenged of his love, and vilified his bravery, Macbeth would not have been pressured into the murder of his king and thrust onto a path of malevolence led by ambition.