Theme 1: Great ambition, or inordinate lust for power, ultimately brings ruin. For ignoring this ancient rule of living, Macbeth and Lady Macbeth pay with their lives.
Theme 2 Evil wears a pretty cloak. Early in the play, the three witches tell Macbeth that "fair is foul,” a paradox suggesting that whatever appears good is really bad. For example, murdering Duncan appears to be a “fair” idea to Macbeth and Lady Macbeth, for Macbeth would accede to the throne. But the Macbeths soon discover that only bad has come of their deed, and their very lives–and immortal souls–are in jeopardy. Macbeth also perceives the prophecies made by the “armed head” and the “bloody child” as good omens; in fact, these prophecies are deceptive wordplays that foretell Macbeth’s downfall. In a further exposition of the theme of deceptive appearances, King Duncan speaks the following lines when arriving at Macbeth’s castle:
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..................This castle hath a pleasant seat; the air
..................Nimbly and sweetly recommends itself
..................Unto our gentle senses. (Act I, Scene VI)
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Theme 3 Temptation can defeat even the strongest human beings. On the battlefield, Macbeth is a lion and a leader of men. But when the witches tempt him by prophesying that he will become king of Scotland, he succumbs to the lure of power. When his resolve weakens, Lady Macbeth fortifies it with strong words.
Theme 4 Guilt haunts the evildoer. Whether from prick of conscience or fear of discovery, Macbeth’s guilt begins to manifest itself immediately after he murders Duncan and the guards (Act II, Scene II). “This is a sorry sight,” he tells Lady Macbeth, looking at the blood on his hands. When he speaks further of the guilt he feels, Lady Macbeth–foreshadowing her descent into insanity–says, “These deeds must not be thought / After these ways; so, it will make us mad.” Macbeth then says he thought he heard a voice saying, “Sleep no more! / Macbeth does murder sleep.”