Clement of Alexandria
The Stromata, or Miscellanies
Book VI
Chapt 5
And further, that the same God that furnished both the Covenants was the giver of Greek philosophy to the Greeks, by which the Almighty is glorified among the Greeks, he shows. And it is clear from this. Accordingly, then, from the Hellenic training, and also from that of the law are gathered into the one race of the saved people those who accept faith: not that the three peoples are separated by time, so that one might suppose three natures, but trained in different Covenants of the one Lord, by the word of the one Lord. For that, as God wished to save the Jews by giving to them prophets, so also by raising up prophets of their own in their own tongue, as they were able to receive God's beneficence, He distinguished the most excellent of the Greeks from the common herd, in addition to "Peter's Preaching," the Apostle Paul will show, saying:
"Take also the Hellenic books, read the Sibyl, how it is shown that God is one, and how the future is indicated. And taking Hystaspes, read, and you will find much more luminously and distinctly the Son of God described, and how many kings shall draw up their forces against Christ, hating Him and those that bear His name, and His faithful ones, and His patience, and His coming."
There is a ton of stuff in passages like this one that merit investigating. My primary point of this thread was to illustrate that the Greek culture and learning was held in such esteem that leading Christians assumed their God had in fact been responsible for much of the Greek understanding. God had revealed himself to the Greeks just as he had to the Jews. It was all the same God. Of course they now regarded this ancient wisdom as outdated, in light of their present understanding.
The 'Sibyl' here refers to the Sibylline Oracles. A topic that could fill volumes, in short they were ostensibly the prophetic ecstatic utterances of a pagan prophetess but are actually largely Jewish and Christain forgeries. The Oracles of Hystaspes were ostensibly Zoroastrian apocalyptic/ prophetic works, that have also been modified/interpolated by Jewish and Christian hands.
Peter's Preaching that was cited as endorsing the pagan works was another now lost book that was ostensibly by the Apostle Peter. Similarly, the Paul quotation is from another now lost work ostensibly by the Apostle Paul.