“My voice is in my sword”

• he emphasises his commitment to justice and his determination to confront Macbeth with action, rather than words.
• highlights Macduff’s belief that speech and negotiation are insufficient in the face of Macbeth’s tyranny.
• instead, only violence and retribution can restore order to Scotland. 
• metaphorical use of “voice” suggests that Macduff’s sword, his instrument of vengeance, is his true means of communication.
• His “sword” is a symbolic expression of his resolve to end Macbeth’s reign through force.
• contrasts Macduff’s proactive approach with Macbeth’s reliance on manipulation and deceit to achieve his goals. 
• Macduff’s pursuit of vengeance is framed not as personal revenge, but as an act of moral necessity to rid Scotland of its tyrant.
• emphasising the sword as his “voice,” he asserts that words and appeals to justice have failed, and that only through direct action can Scotland be saved.
• captures Macduff’s role as the agent of justice, whose actions will restore order and end the devastation Macbeth has wrought.