Macbeth's central argument is that the pursuit of kingship through murder leads to an unceasing cycle of violence and psychological torment, ultimately rendering life meaningless. After killing Duncan and Banquo, Macbeth finds no peace. Instead, he is plagued by "terrible dreams" and "restless ecstasy," lamenting that he is "scorch'd the snake, not kill'd it." This underscores the idea that violent acts, once initiated, create new threats and anxieties, as shown by Macbeth's fear of Banquo's lineage and his subsequent orchestration of Banquo's murder.
The narrative illustrates the devastating consequences of ambition unchecked by morality, where "what's done is done" provides no solace. Macbeth's descent into sleeplessness, paranoia, and an existential dread culminates in his famous soliloquy: "Tomorrow, and tomorrow, and tomorrow, / Creeps in this petty pace... And all our yesterdays have lighted fools / The way to dusty death." The play demonstrates that actions born of guilt and fear lead to a life perceived as "a walking shadow; a poor player, / That struts and frets his hour upon the stage, / And then is heard no more."
Key concepts
- Fruitless crown — The symbol of Macbeth's kingship, gained through murder but offering no satisfaction or lineage, as his "genius is rebuk’d" and no son will succeed him.
- Murder of sleep — Macbeth’s literal and metaphorical inability to rest after his crimes, signifying the profound psychological toll of his violent actions.
- Restless ecstasy — The torment of Macbeth's mind, a state of agonizing wakefulness and fear that is worse than death itself.
- Banquo's issue — The lineage of Banquo, whose kingship is prophesied and whose existence directly fuels Macbeth's murderous paranoia and actions.
- Life's but a walking shadow — Macbeth's final nihilistic view of existence, born from his experiences of guilt, loss, and the ultimate futility of his violent reign.