* When shall we three meet again / In thunder, lightning, or in rain?? This phrase is also spoken by the witches in Act 1, Scene 1. It foreshadows the stormy weather that will accompany the witches' next meeting.
* By the pricking of my thumbs, / Something wicked this way comes.: This phrase is spoken by the witches in Act 4, Scene 1. It indicates that something evil is approaching.
* Double, double toil and trouble; / Fire burn, and cauldron bubble: This phrase is spoken by the witches in Act 4, Scene 1. It is a incantation that they use to brew their magic potion.
* Life's but a walking shadow, a poor player / That struts and frets his hour upon the stage / And then is heard no more: This phrase is spoken by Macbeth in Act 5, Scene 5. It expresses his disillusionment with life and his sense that everything is meaningless.