John Chrysostom, on Titus 1:12

There are several questions here. First, who it was that said this? Secondly, why Paul quoted it? Thirdly, why he brings forward a testimony that is not correct? Let us then offer a seasonable solution of these, having premised some other things. For when Paul was discoursing to the Athenians, in the course of his harangue he quoted these words, "To the Unknown God": and again, "For we also are His offspring, as certain also of your own poets have said." (Acts xvii. 23, Acts xvii. 28.) It was Epimenides who said this, himself a Cretan, and whence he was moved to say it is necessary to mention. It is this. The Cretans have a tomb of Jupiter, with this inscription. "Here lieth Zan, whom they call Jove." On account of this inscription, then, the poet ridiculing the Cretans as liars, as he proceeds, introduces, to increase the ridicule, this passage.

For even a tomb, O King, of thee
They made, who never diedst, but aye shalt be.

If then this testimony is true, observe what a difficulty! For if the poet is true who said that they spoke falsely, in asserting that Jupiter could die, as the Apostle says, it is a fearful thing! Attend, beloved, with much exactness. The poet said that the Cretans were liars for saying that Jupiter was dead. The Apostle confirmed his testimony: so, according to the Apostle, Jupiter is immortal: for he says, "this witness is true"! What shall we say then? Or rather how shall we solve this? The Apostle has not said this, but simply and plainly applied this testimony to their habit of falsehood. Else why has he not added, "For even a tomb, O king, of thee, they made"? So that the Apostle has not said this, but only that one had well said, "The Cretans are always liars." But it is not only from hence that we are confident that Jupiter is not a God. From many other arguments we are able to prove this, and not from the testimony of the Cretans. Besides, he has not said, that in this they were liars. Nay and it is more probable that they were deceived as to this point too. For they believed in other gods, on which account the Apostle calls them liars.

And as to the question, why does he cite the testimonies of the Greeks? It is because we put them most to confusion when we bring our testimonies and accusations from their own writers, when we make those their accusers, who are admired among themselves.