Caesarius of Arles : Moreover, as we are wont to sing in the hymn, "God is faithful, without deceit." For this reason, as I mentioned above, we should believe without any doubt concerning Pharaoh that he became hardened because of God's patience rather than his power. This fact we know clearly from his own admission, for when he was being punished he confessed in this way as justice compelled him: "The Lord is just; it is I and my subjects who are at fault." With what feelings then does a Christian complain that God is unjust, when even a wicked king admits that he is just?" — SERMON 101.5 Ephrem the Syrian : Pharaoh said to Moses, "This time I have sinned." And the previous times he hardened his heart, did he not sin? And even if he sinned the previous times, he did not sin the way he did this time. [The Lord] warned him to bring in the cattle, but he was not persuaded. This is why his offense was more serious in this plague than in all the [other] plagues. — COMMENTARY ON Exodus 9:4 Origen of Alexandria : See whether it is for this reason that God hardens the heart of Pharaoh, so that at a moment when he was not hardened he could say, "The Lord is just: I and my people are wicked." His heart has to be hardened further, and he has to suffer more, that he may not, because he has been freed of his hardheartedness too quickly, think too lightly of that hardheartedness and so may have to have his heart hardened over and over again. — ON PRAYER 29.16