Classical antiquity
Horace. Epistularum liber primus [First Book of Letters]. 20 BC, bk. 1, epistle 2.
Horace. "Epistles." Satires and Epistles, translated by John Davie. Oxford University Press, 2011, bk. 1, epistle 2.
Virgil. Eclogae [Eclogues]. c. 30 BC, no. 9.
Virgil. "The Eclogues." The Eclogues and The Georgics, translated by C. Day Lewis. Oxford University Press, 2009, no. 9.
Sophocles. Phaedra. c. 5th century BC, fragment 612.
Carus, Titus Lucretius. De Rerum Natura [On the Nature of Things]. c. 55 BC, bk. 4, l. 637.
Carus, Titus Lucretius. The Nature of Things, translated by Alicia Stallings. Penguin Classics, 2007, bk. 4, l. 637.
Juvenal. Satirae [Satires]. c. 127, satire 13.
Juvenal. The Satires, translated by Niall Rudd. Oxford University Press, 2008, satire 13.
Aurelius, Marcus. Meditations. c. 180, bk. 5.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 5.
Sophocles. Ἀντιγόνη [Antigone]. c. 441 BC, Festival of Dionysus, Athens, Greece.
Sophocles. "Antigone." The Oedipus Cycle: Oedipus Rex; Oedipus at Colonus; Antigone, translated by Dudley Fitts and Robert Fitzgerald. Mariner Books, 2002.
Virgil. Eclogae [Eclogues]. c. 30 BC, no. 1.
Virgil. "The Eclogues." The Eclogues and The Georgics, translated by C. Day Lewis. Oxford University Press, 2009, no. 1.
Hippocrates. Aphorisms. c. 370 BC, sect. 1, pt. 1.
Hippocrates. The Aphorisms. Classics of Medicine Library, 1982, sect. 1, pt. 1.
Matthew 26:41
The Holy Bible: The King James Version. 1611. (Matthew 26:41).
Xenophanes. Fragments. 5th century BC, F31 - DK22 B116.
Xenophanes. "Xenophanes of Colophon." The First Philosophers: The Presocratics and Sophists. Oxford World Classics, 2009, F31 - DK22 B116.
Martial. Epigrammata [Epigrams]. c. 102 AD, bk. 10, no. 47.
Martial. Epigrams, translated by Gideon Nisbet. Oxford University Press, 2015, bk. 10, no. 47.
The Holy Bible: The King James Version. 1611. (Ephesians 6:11).
Jeremiah 23:24
The Holy Bible: The King James Version. 1611. (Jeremiah 23:24).
Sallust. Bellum Catilinae [War of Catiline]. c. 43–40 BC.
Sallust. "The War with Catiline." The War with Catiline and The War with Jugurtha, translated by John T. Ramsey J. C. Rolfe. Harvard University Press, 2013.