By the pricking of my thumbs, Something wicked this way comes. 2nd Witch, Act 4, Scene I
Macbeth
Double, double toil and trouble; Fire burn and cauldron bubble. Act IV, Scene 1
Macbeth
Fair is foul, and foul is fair. Act I, sc. 1.
Macbeth
If it were done, when 'tis done, then 'twere well it were done quickly. Act I, sc. 7.
Macbeth
I have no spur to prick the sides of my intent, but only vaulting ambition, which o'erleaps itself, and falls on the other. Act I, sc. 7.
Macbeth
What's done cannot be undone. Act V, sc. 1.
Macbeth