If it were done, when 'tis done, then 'twere well it were done quickly.

More from Macbeth

• By the pricking of my thumbs, Something wicked this way comes.
• Double, double toil and trouble; Fire burn and cauldron bubble.
• Fair is foul, and foul is fair.
• I have no spur to prick the sides of my intent, but only vaulting ambition, which o'erleaps itself, and falls on the other.
• She should have died hereafter- there would have been time for such a thing.
• There’s no art To find the mind’s construction in the face