There's nothing of so infinite vexation As man's own thoughts. — John Webster

Webster, John. "The White Devil." The Duchess of Malfi, The White Devil, The Broken Heart and 'Tis Pity She's a Whore, edited by Jane Kingsley-Smith. Penguin Classics, 2015, act 5, sc. 6.

Webster, John. The White Divel; or, The Tragedy of Paulo Giordano Ursini, Duke of Brachiano. With The Life and Death of Vittoria Corombona the famous Venetian Curtizan. 1612, Red Bull Theatre, Clerkenwell, London, England, UK, act 5, sc. 6.