Exod 1:14

“Perhaps it is in this sense that God is said to have hardened the heart of Pharaoh, because the substance of his heart was obviously such as to elicit from the Sun of justice not his illumination but his power to harden and to scorch. That no doubt was the reason why this same Pharaoh afflicted the life of the Hebrews with hard work and wore them out with clay and bricks. And certainly the works that he devised came from a heart as miry and muddy! And as the visible sun contracts and hardens the substance of clay, so with the same rays by which he enlightened the people of Israel and by means of those rays' same properties the Sun of justice hardened the heart of Pharaoh that harbored muddy devices.”

“When the children of Israel were in Egypt, they were afflicted with mortar and brick for the works of Pharaoh the king until they cried out in their groaning to the Lord. And he heard their cry and sent his word to them by Moses and led them out of Egypt. When we were also in Egypt, I mean in the errors of this world and in the darkness of ignorance, we then did the works of the devil in lusts and desires of the flesh. But the Lord had pity on our affliction and sent the Word, his only begotten Son, to deliver us from ignorance of our error and to lead us to the light of divine law.”

“We have been led out of Egypt where we were serving the devil as a pharaoh, where we were doing works of clay amid earthly desires, and we were laboring much in them. For Christ cried out to us, as if we were making bricks, "Come to me, all you who labor and are burdened." Led out of here, we were led over through baptism as through the Red Sea—red for this reason, because consecrated by the blood of Christ—when all our enemies who were assailing us were dead, that is, when our sins have been wiped out.”