The hours of prayer

Now, if some assign definite hours for prayer— as, for example, the third, and sixth, and ninth— yet the Gnostic prays throughout his whole life, endeavoring by prayer to have fellowship with God. And, briefly, having reached to this, he leaves behind him all that is of no service, as having now received the perfection of the man that acts by love. But the distribution of the hours into a threefold division, honored with as many prayers, those are acquainted with, who know the blessed triad of the holy abodes.

Clement of Alexandria
The Stromata, Book VII
Chapter VII

God gave both the Hebrew covenants and Greek philosophy

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.

…But as the proclamation [of the Gospel] has come now at the fit time, so also at the fit time were the Law and the Prophets given to the Barbarians, and Philosophy to the Greeks, to fit their ears for the Gospel.

Clement of Alexandria
The Stromata, Book VI
Chapter V & VI