Classical antiquity
Quoted in Plutarch's Lives, by Plutarch
Themistocles. Quoted in "Themistocles." Parallel Lives by Plutarch. c. 2nd century BC, ch. 2, sect. 3.
Themistocles. Quoted in "Themistocles." Parallel Lives by Plutarch. Oxford University Press, 2009, ch. 2, sect. 3.
Matthew 18:20
The Holy Bible: The King James Version. 1611. (Matthew 18:20).
Quoted in The Enchiridion, by Arrian
Epictetus. Ἐγχειρίδιον Ἐπικτήτου, Enkheirídion Epiktḗtou [Enchiridion of Epictetus]. c. 125 CE, ch. 15.
Epictetus. Enchiridion, translated by George Long. Dover Publications, 2004, ch. 15.
Bion. Quoted in "De sollertia animalium [Whether Land or Sea Animals are Cleverer]." Moralia [Morals], written by Plutarch. c. 100.
Bion. Quoted in "Whether Land or Sea Animals are Cleverer." Moralia, written by Plutarch. Vol. 12, Harvard University Press, 1957.
Horace. Epodi [Epodes]. 30 BC, epode 2, l. 1.
Horace. "Epodes." The Complete Odes and Epodes, translated by David West. Oxford University Press, 2008, epode 2, l. 1.
Job 38:4
The Holy Bible: The King James Version. 1611. (Job 38:4).
Pindar. Pythian Odes. c. 474, pythian 8.
Pindar. The Complete Odes, translated by Anthony Verity. Oxford University Press, 2008, pythian 8.
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.
Epictetus. Ἐπικτήτου διατριβαί, Epiktētou diatribai [The Discourses of Epictetus]. c. 108, bk. 1, ch. 16.
Epictetus. "The Discourses." Discourses and Other Writings, edited and translated by Robert Dobbin. Penguin Classics, 2008, bk. 1, ch. 16.