Act 1, Scene 7 of Macbeth is one of the most psychologically rich scenes in all of Shakespeare. It opens in the dining hall of Macbeth's castle at Inverness, where servants bustle past carrying dishes for the royal banquet. King Duncan is being honored as an esteemed guest, and the atmosphere of hospitality makes what follows all the more disturbing.
Left alone, Macbeth delivers his famous soliloquy beginning with "If it were done when 'tis done, then 'twere well / It were done quickly." In this remarkable speech, he wrestles with the moral and practical consequences of assassinating Duncan. He acknowledges that if the murder could be completed without repercussion, he would do it swiftly. But he recognizes that violent deeds teach others to respond in kind: "Bloody instructions, which being taught return / To plague the inventor." The image of a "poison'd chalice" returned to the poisoner's own lips captures his fear that the crime will rebound upon him.
Macbeth then catalogs his reasons against the murder with striking clarity. He is Duncan's kinsman, subject, and host, each role carrying a sacred obligation of loyalty and protection. Moreover, Duncan has been such a virtuous ruler, "so clear in his great office," that his murder would provoke universal horror. Shakespeare deploys breathtaking imagery here: Duncan's virtues will "plead like angels trumpet-tongued" against the act, and pity itself, "like a naked new-born babe," will expose the crime to the world. By the end of the soliloquy, Macbeth confesses that he possesses no legitimate motive except "vaulting ambition" alone, an ambition that "o'erleaps itself / And falls on the other."
When Lady Macbeth enters, Macbeth tells her plainly: "We will proceed no further in this business." He values the "golden opinions" he has recently earned and does not want to discard them. This is the closest Macbeth comes to moral clarity in the entire play, and it is the turning point that Lady Macbeth must overcome.
Her response is a masterclass in psychological manipulation. She attacks his manhood and courage, asking whether the ambition that drove him to propose the murder was merely drunken bravado. She delivers one of the play's most shocking speeches, declaring that she would have "dash'd the brains out" of her own nursing infant rather than break such a promise. This horrifying image is designed to shame Macbeth into action by contrasting her own ruthless determination with his hesitation.
Lady Macbeth then pivots from emotional assault to cold strategy. She outlines a practical plan: once Duncan falls asleep, she will ply his two chamberlain guards with wine and wassail until they pass out. She and Macbeth will then commit the murder and smear the guards with Duncan's blood, framing them as the killers. The plan's elegance sways Macbeth, who marvels at her "undaunted mettle."
The scene closes with Macbeth's fateful decision. His final words, "False face must hide what the false heart doth know," signal his commitment to deception and mark the point of no return. The moral debate is over; the conspiracy is sealed. From this moment forward, the tragedy accelerates toward its bloody conclusion.