In truth we know nothing, for truth lies in the depth.

Aristotle. Quoted in The Lives of Eminent Philosophers, written by Diogenes Laërtius, translated by Pamela Mensch, edited by James Miller. Oxford University Press, 2018, bk. 5, ch. 1, sect. 17.

Twain, Mark. Adventures of Huckleberry Finn, edited by R. Kent Rasmussen. Penguin Classics, 2014, ch. 1.

Chilon. Quoted in The Lives of Eminent Philosophers, written by Diogenes Laërtius, translated by Pamela Mensch, edited by James Miller. Oxford University Press, 2018, bk. 1, ch. 3.

Aristotle. Politics, translated by R. F. Stalley and Sir Ernest Barker. Oxford University Press, 2009, bk. 4.