Augustine of Hippo : Is not sin also punishment for sin?… We can recount many other events clearly showing that perversity of heart comes from a hidden judgment of God, with the result that a refusal to hear the truth leads to commission of sin, and this sin is also punishment for preceding sin. — AGAINST JULIAN 5:3.12 Caesarius of Arles : Behold how a person is hardened if he does not merit to be chastised by the Lord for his correction? Moreover, what is written concerning those whom God's mercy does not even allow to become hardened? "God scourges every child whom he receives"; … and again, "For whom God loves he reproves." Concerning this hardening the prophet also exclaims to the Lord in the person of the people, "Why do you harden our hearts that we fear you not?" Surely this is nothing else than, You have abandoned our heart, that we should be converted to you. — SERMON 101:3 Isidore of Seville : The punishment for previous sins is called "hardening" that comes from the divine righteousness.… While those who are righteous are in no way driven by God to become evil, nevertheless, when they are evil they are hardened so that they become worse, as the apostle says, "Since they did not receive the love of God's truth that they might be saved, God sent them a spirit of error." So God made them sin. But in these cases there was so much sin that came before that they deserved to become worse.… Some sins come from God's anger which are balanced against the merit of other sins. — THREE BOOKS OF THOUGHTS 2:19.5-6 Theodoret of Cyrus : Your great tolerance encouraged our shamelessness. When you did not punish our sins, we remained transgressors, disregarding your laws. In the same sense, God said to the blessed Moses, "I will harden Pharaoh's heart." He used his great forbearance and tolerance and punishes Pharaoh only with frogs and locusts and flies to begin with, and Pharaoh thought that God could not increase the level of punishment.… You have been patient for a long time; you have not disciplined us, seeing us transgressing without a care; we have accordingly hardened our hearts and as a consequence left the straight path. — COMMENTARY ON Isaiah 20:63.17