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Orwell, George. Homage to Catalonia. Secker and Warburg, 1938, ch. 5.
Miller, Henry. Tropic of Cancer. Obelisk Press, 1934.
Seneca the Younger. Epistulae Morales ad Lucilium [Moral Letters to Lucilius]. c. 65 AD.
Seneca, Lucius Annaeus. Letters on Ethics, translated by Margaret Graver and A. A. Long. University of Chicago Press, 2017.
Saint Jerome. Letter to Heliodorus." c. 396, sect. 19.
Saint Jerome. "Letter LX." Select Letters of Saint Jerome. Aeterna Press, 2015, sect. 19.
Naipaul, V. S. A Bend in the River. Alfred A Knopf, 1979, pt. 1.
Dickinson, Emily. We Never Know How High We Are. Poems by Emily Dickinson: Third Series. Boston: Roberts Brothers, 1896, I. 1.
Dickinson, Emily. "We Never Know How High We Are." Emily Dickinson’s Poems: As She Preserved Them, edited by Cristanne Miller. Belknap Press, 2016, I. 1.
Yeats, William Butler. "In Memory of Eva Gore Booth and Con Markiewicz." The Winding Stair and Other Poems. The Macmillan Company, 1933, I. 24.
Yeats, William Butler. "In Memory of Eva Gore Booth and Con Markiewicz." W. B. Yeats: The Major Works, edited by Edward Larrissy. Oxford University Press, 2008, I. 24.
Burke, Edmund. Philosophical Enquiry in the Origin of Our Ideas of the Sublime and Beautiful. London: R and J. Dodsley, 1757, pt. 4, sect. 18.
Burke, Edmund. "Philosophical Enquiry in the Origin of Our Ideas of the Sublime and Beautiful." The Portable Edmund Burke, edited by Isaac Kramnick. Penguin, 2009, pt. 4, sect. 18.
Quoted in The Life of Samuel Johnson, LL.D, by James Boswell
Johnson, Samuel. Quoted in journal entry, written by James Boswell. 19 Sept. 1777.
Johnson, Samuel. Quoted in The Life of Samuel Johnson, written by James Boswell, edited by David Womersley. Penguin Classics, 2008.
Cather, Willa. O Pioneers! Houghton Mifflin Company, 1913, pt. 5, ch. 3.
Cather, Willa. O Pioneers, edited by Sharon O'Brien. W. W. Norton & Company, 2007, pt. 5, ch. 3.
"Sapere aude" is a Latin phrase meaning "dare to know."
Kant, Immanuel. "Beantwortung der Frage: Was ist Aufklärung? [Answering the Question: What is Enlightenment?]." Berlinische Monatsschrift, Dec. 1784.
Kant, Immanuel. "An Answer to the Question: 'What is Enlightenment'?" Kant: Political Writings, edited by H. S. Reiss, translated by H. B. Nisbet. Cambridge University Press, 1991.
Yeats, William Butler. Letter to Frederick J. Gregg. 1886.
Yeats, William Butler. "To F. J. Gregg [late summer 1886]." The Collected Letters of W. B. Yeats. Volume I: 1865-1895, edited by John Kelly. Oxford University Press, 1986.
Catullus, Gaius Valerius. Carmina. c. 1481, no. 70, l. 3.
Cattulus, Gaius Valerius. The Poems of Catullus, translated by Guy Lee. Oxford University Press, 2009, no. 70, l. 3.
Milton, John. The Tenure of Kings and Magistrates. London: Matthew Simons, 1649.
Milton, John. "The Tenure of Kings and Magistrates." John Milton: Major Works, edited by Stephen Orgel and Jonathan Goldberg. Oxford University Press, 2008.
Orwell, George. "The Sporting Spirit." Tribune (London), 14 Dec. 1945.
Orwell, George. "The Sporting Spirit." The Collected Essays, Journalism and Letters of George Orwell, vol. 4: In Front of Your Nose 1945-1950, edited by Sonia Orwell and Ian Angus. David R. Godine, 1999, no. 12.
Burke, Edmund. Thoughts on the Cause of the Present Discontents. London: J. Dodsley, 1770.
Burke, Edmund. "Thoughts on the Present Discontents." The Portable Edmund Burke, edited by Isaac Kramnick. Penguin, 2009.
Shakespeare, William. The Comedy of Errors. 1594, Gray's Inn Hall, London, England, UK, act 2, sc. 2.
Shakespeare, William. "The Comedy of Errors." The Norton Shakespeare, edited by Stephen Greenblatt, et al., 3rd ed., W. W. Norton & Company, 2015, act 2, sc. 2.
Cather, Willa. O Pioneers! Houghton Mifflin Company, 1913, pt. 2, ch. 8.
Cather, Willa. O Pioneers, edited by Sharon O'Brien. W. W. Norton & Company, 2007, pt. 2, ch. 8.
Rand, Ayn. The Fountainhead. Bobbs Merrill, 1943, pt. 4, ch. 18.