Theophylact of Bulgaria
It is asked why he cited testimony from Greek writers and approved it, although it is unjust. And who said this? True, Epimenides said it. He was more occupied than all the Greek sages with predictions and the appeasing of the gods, and was famed for the beneficent gift of divination. Indeed, when he saw that the Cretans had built a tomb for Zeus and began to honor him as some mere man, he was, as it were, zealous for the glory of his ancestral god. He composed the following address to Zeus: being such and such, the Cretans built a tomb for you. Yet you have not died. You live forever.
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Paul now bears witness to the truth of this saying. How does he do this? For if it was said truly, then Zeus is immortal. No, the Apostle did not pay attention to that when he said the testimony was true. He referred to the fact that Epimenides called the Cretans liars and the rest. What profit is there in a pagan testimony? By this he acted upon them most effectively, presenting their own writers as proof of their arrogance. Paul usually does this. In the same way he reasoned with the Athenians on the basis of Aratus. What Aratus ascribed to the falsely named god Zeus, Paul referred to the true God. On the basis of their own testimonies they could be persuaded more readily. In the same way he speaks with the Jews on the basis of the prophets, and not on the basis of the Gospels. God also acts this way, drawing each person to Himself by a way familiar and trustworthy to him. Thus He drew the Magi through a star (Mt 2), and Saul through the sorceress (1 Sam 28), since he believed her. He drew the diviners through the animals, the cows that carried the ark. This does not mean that pagan diviners speak the truth. On the contrary, He rebukes them by their own mouths. God also allows Balaam to bless and prophesy (Num 23 and Num 24). For He always customarily shows condescension for our benefit.
Why, then, did Christ and Paul forbid demons to speak and testify? Because the signs were sufficient for faith. Christ Himself preached concerning Himself, and this was enough. Moreover, worship was not rendered to demons, and the idol did not speak by itself. Therefore the demons were forbidden to speak.