Clement of Alexandria, The Instructor 3.57.1, in The Ante-Nicene Fathers, ed. A Roberts and J. Donaldson (Grand Rapids, MI: Eerdmans, 1986 [reprint]), vol. 2, p. 285. For the following Clement quotations, see Instructor 3.57–58 (pp. 285–286 in Roberts and Donaldson).