And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.
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Augustine of Hippo
AD 430
God constantly says, “I will harden Pharaoh’s heart,” and gives the reason why he does this. He says, “I will harden Pharaoh’s heart and fulfill my signs and my portents in Egypt,” as if the hardening of Pharaoh’s heart were necessary so that God’s signs might be multiplied and fulfilled in Egypt. God makes good use of bad hearts for what he wishes to show to those who are good or those he is going to make good. And the quality of evil in each heart (that is, what sort of heart is disposed to evil) came about through its own evildoing, which grew from the choice of the will. Still, those evils in quality, so that the heart is moved this way or that, when it is moved to evil this way or that way, comes to be by causes by which the soul is driven. And whether these causes either exist or do not exist is not within the power of man. They come from the providence of God that is hidden, most just and clearly most wise, who disposes and administers the universe that he created. So that Phara...
I shall harden; not by being the efficient cause of his hardness of heart, but by permitting it; and by withdrawing grace from him, in punishment of his malice; which alone was the proper cause of his being hardened. (Challoner)
He took occasion even from the miracles to become more obdurate. (Haydock)
Yet Pharao was less impious than Calvin, for he takes the sin to himself, chap. ix. 27. (Tirinus)
I shall harden: not by being the efficient cause of his hardness of heart, but by permitting it; and by withdrawing grace from him, in punishment of his malice; which alone was the proper cause of his being hardened.