Tatian, Oratio ad Græcos, c. 18. It is quite probable that Tatian is here appealing, not to a written work of Justin’s, but to a statement which he had himself heard him make. See Harnack’s Ueberlieferung der griech. Apologeten, p. 130. Harnack is undoubtedly correct in maintaining that Tatian’s Oratio is quite independent of Justin’s Apology and other writings.