The unknown
"Follow the Yellow Brick Road/You're Off to See the Wizard." The Wizard of Oz. Directed by Victor Fleming, composed by Harold Arlen, lyrics by Harburg, Edgar Yipsel "Yip." Metro-Goldwyn-Mayer, 1939.
Rumsfeld, Donald. Department of Defense news briefing. 12 Feb. 2002, Pentagon, Washington, DC, USA.
Harvey, William. "Dedication to Dr. Argent and Other Learned Physicians." Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus [An Anatomical Exercise on the Motion of the Heart and Blood in Living Beings]. Frankfurt: William Fitzer, 1628.
"A Thing About Machines." The Twilight Zone, directed by David Orrick McDearmon, written by Rod Serling, season 2, episode 4, Cayuga Productions/CBS Productions, 1960.
Alighieri, Dante. "Paradiso [Paradise]." La Comedia di Dante Alleghieri [The Divine Comedy by Dante Alighieri]. Foligno: Johann Numeister and Evangelista Angelini da Trevi, 1472.
Alighieri, Dante. "Paradiso." The Divine Comedy, edited by David H. Higgins, translated by C. H. Sisson. Oxford University Press, 2008.
Plato. Ἀπολογία Σωκράτους [Apology of Socrates]. Speech of legal self-defence which Socrates spoke at his trial for impiety and corruption. 399 BC, Athens, Greece.
Plato. "Apology." Plato: Euthyphro; Apology; Crito; Phaedo, translated by Christopher Emlyn-Jones and William Preddy. Harvard University Press, 2017.
Pascal, Blaise. Pensées [Thoughts]. Paris: Chez G. Desprez, 1670, no. 556.
Pascal, Blaise. "Pensées." Pensées and Other Writings, edited by Anthony Levi, translated by Honor Levi. Oxford University Press, 2008, no. 556.
Plato. Ἀπολογία Σωκράτους [Apology of Socrates]. Speech of legal self-defence which Socrates spoke at his trial for impiety and corruption. 399 BC, Athens, Greece.
Plato. "Apology." Plato: Euthyphro; Apology; Crito; Phaedo, translated by Christopher Emlyn-Jones and William Preddy. Harvard University Press, 2017.
Kierkegaard, Soren [published as Johannes de silentio]. Frygt og Bæven [Fear and Trembling]. Copenhagen: C. A. Reitzel, 1843.
Kierkegaard, Soren. Fear and Trembling, translated by Alastair Hannay. Penguin Classics, 1986.
Magritte, Rene. Quoted in Magritte by Suzy Grablik. New York Graphic Society, 1970.