These scenes are dominated by Lady Macbeth, who is probably the most memorable character in the play. Her violent, blistering soliloquies in Act I, scenes v and vii, testify to her strength of will, which completely eclipses that of her husband. She is well aware of the discrepancy between their respective resolves and understands that she will have to manipulate her husband into acting on the witches’ prophecy. Her soliloquy in Act I, scene v, begins the play’s exploration of gender roles, particularly of the value and nature of masculinity. In the soliloquy, she spurns her feminine characteristics, crying out “unsex me here” and wishing that the milk in her breasts would be exchanged for “gall” so that she could murder Duncan herself. These remarks manifest Lady Macbeth’s belief that manhood is defined by murder. When, in Act I, scene vii, her husband is hesitant to murder Duncan, she goads him by questioning his manhood and by implicitly comparing his willingness to carry through on his intention of killing Duncan with his ability to carry out a sexual act (I.vii.38–41). Throughout the play, whenever Macbeth shows signs of faltering, Lady Macbeth implies that he is less than a man.

Macbeth exclaims that Lady Macbeth should “[b]ring forth men-children only” because she is so bold and courageous (I.vii.72). Since Macbeth succumbs to Lady Macbeth’s wishes immediately following this remark, it seems that he is complimenting her and affirming her belief that courage and brilliance are masculine traits. But the comment also suggests that Macbeth is thinking about his legacy. He sees Lady Macbeth’s boldness and masculinity as heroic and warriorlike, while Lady Macbeth invokes her supposed masculine “virtues” for dark, cruel purposes. Unlike Macbeth, she seems solely concerned with immediate power.

A subject’s loyalty to his king is one of the thematic concerns of Macbeth. The plot of the play hinges on Macbeth’s betrayal of Duncan, and, ultimately, of Scotland. Just as Lady Macbeth will prove to be the antithesis of the ideal wife, Macbeth proves to be a completely disloyal subject. In Act I, scene vii, for instance, Macbeth muses on Duncan’s many good qualities, reflects that Duncan has been kind to him, and thinks that perhaps he ought not to kill his king. This is Macbeth’s first lengthy soliloquy and thus the audience’s first peek inside his mind. Yet Macbeth is unable to quell his desire for power. He evades answering his own questions of loyalty and yearns unrealistically for the battlefield’s simple and consequence-free action—“If it were done when ’tis done,” he says, “then ’twere well / It were done quickly” (I.vii.1–2).

At the same time, Macbeth is strongly conscious of the gravity of the act of regicide. He acknowledges that “bloody instructions . . . being taught, return / To plague th’inventor” (I.vii.9–10). This is the first of many lines linking “blood” to guilt and cosmic retribution.

As her husband wavers, Lady Macbeth enters like a hurricane and blows his hesitant thoughts away. She spurs Macbeth to treason by disregarding his rational, moral arguments and challenging his manhood. Basically, she dares him to commit the murder, using words that taunt rather than persuade. Under her spell, all of Macbeth’s objections seem to evaporate and he is left only with a weak “If we should fail?” to set against her passionate challenge (I.vii.59).

The idea of a moral order is present in these scenes, albeit in muted form. Macbeth knows what he does is wrong, and he recognizes that there will surely be consequences. As we have seen, his soliloquy reveals his awareness that he may be initiating a cycle of violence that will eventually destroy him. Macbeth is not a good man at this point in the play, but he is not yet an evil one—he is tempted, and he tries to resist temptation. Macbeth’s resistance, however, is not vigorous enough to stand up to his wife’s ability to manipulate him.