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 1, scene 7, 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” (1.7.1–2).

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” (1.7.9–10). 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 (1.7.59).

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.