“... As a work of apologetic addressed to a non-Christian audience, the author tends to refrain from textual citations of authorities not shared with his audience, until the final chapter, when he begins to contemplate Diognetus’ conversion. But he certainly appears to be indebted to the Fourth Gospel in his view of the relation of the Christian to the world. ‘Christians’, he says, ‘dwell in the world, but are not of the world (ἐν κόσμῳ οἰκοῦσιν οὐκ εἰσὶ δὲ ἐκ τοῦ κόσμου)’ (Diogn. 6. 3); in John 17, Jesus says, ‘but they are in the world (ἐν τῷ κόσμῳ εἰσίν)’ (17: 11); 17: 14, ‘and the world has hated them because they are not of the world (οὐκ εἰσὶν ἐκ τοῦ κόσμου)’. ...”