Quoted by Ephrem Syrus in his Prose Refutations; cited from John C. Reeves, “Manichaean Citations from the Prose Refutations of Ephrem,” in Emerging from Darkness: Studies in the Recovery of Manichaean Sources NHMS 43, ed. Paul Mirecki and Jason BeDuhn (Leiden: Brill, 1997), p. 263.
