Letter 21: Abraham's statement to the rich man — "Between us and you a great chasm has been fixed" — reveals something crucial...

To Archontios. On reading against the Greeks [the pagans]. On the grace of the divinely inspired Scriptures, and the benefit that comes from them. The deifications of the Greeks, and what they call theogonies [accounts of the birth of the gods], Orpheus and Homer and Hesiod, and all those who followed them, taught, stringing together many books and many opinions. But our religion two volumes will teach, which we have sent you, of which the one is called the Older and the other the New Testament. And whether these tell the truth more than those, both in their names and in their facts, you will find out for yourself, I am persuaded, and you may decide which is the better.

Περὶ ἀναγνώσεως κατὰ Ἑλλήνων. Περὶ τῆς χάριτος τῶν θεοπνεύστων Γραφῶν, καὶ τῆς ἐξ αὐτῶν ὠφελείας. Τὰς [μὲν] Ἑλλήνων θεοποιΐας, καὶ ἃς καλοῦσι θεογονίας, Ὀρφεύς τε καὶ Ὅμηρος καὶ Ἡσίοδος, καὶ ὅσοι κατ’ ἐκείνους, ἐδίδαξαν, πολλὰς καὶ βίβλους καὶ δόξας συνείραντες. Τὴν ἡμετέραν δὲ θρησκείαν δύο πυκταὶ διδάξουσιν, ἃς ἐπέμψαμεν, ὧν ἡ μὲν Πρεσβυτέρα, ἡ δὲ Νέα Διαθήκη προσαγορεύεται. Εἰ δὲ ἀληθεύουσιν αὐταὶ μᾶλλον ἐκείνων καὶ τοῖς ὀνόμασι καὶ τοῖς πράγμασιν, [αὐτὸς] εὑρήσεις, πέπεισμαι, καὶ κρατήσειας τί ἄμεινον.