Augustine of Hippo : For by the heart of flesh and the fleshy tables is not meant a carnal understanding: but as flesh feels, whereas a stone cannot, the insensibility of stone signifies an unintelligent heart, and the sensibility of flesh signifies an intelligent heart. — AGAINST FAUSTUS, A MANICHAEAN 15:4 Augustine of Hippo : If God is not able to remove from the human heart even its obstinacy and hardness, he would not say, through the prophet, "I will take from them their heart of stone and will give them a heart of flesh." … Now can we possibly, without extreme absurdity, maintain that there previously existed in any person the good merit of a good will, to entitle him to the removal of his stony heart, when all the while this very heart of stone signifies nothing else than a will of the hardest kind and such as is absolutely inflexible against God? — ON GRACE AND FREE WILL 29 Augustine of Hippo : Those and other divine testimonies, which it would take too long to enumerate, show that God by his grace takes away the stony heart from unbelievers and forestalls merit in people of good will in such a way that their will is prepared by prevenient grace, but not that grace is given through prevenient merit of the will. This is shown both by thanksgiving and by prayer: prayer for unbelievers; thanksgiving for believers. Prayer is to be made to him that he may do what we ask; thanksgiving is to be offered when he has done it. — LETTER 217 Augustine of Hippo : Flesh is not mentioned in this passage in order to signify carnal desire but rather in the way in which the prophet says that a heart of stone is taken away from the people and a heart of flesh is given them. — ON GENESIS AGAINST THE MANICHAEANS 2:12.17 Augustine of Hippo : This grace, which from divine generosity is bestowed secretly in human hearts, is rejected by no one, no matter how hard-hearted he may be. For it is given so that hardness of the heart may first be taken away. Therefore, when the Father is heard within and teaches, so that one may come to the Son, he takes away the heart of stone and bestows a heart of flesh, as he promised by the word of the prophet. For it is thus that he makes them children of the promise and vessels of mercy that he has prepared for glory. — PREDESTINATION OF THE SAINTS 8:13 Epistle of Barnabas : Behold, therefore, we have been refashioned, as again He says in another prophet, "Behold, saith the Lord, I will take away from these, that is, from those whom the Spirit of the Lord foresaw, their stony hearts, and I will put hearts of flesh within them," because He was to be manifested in flesh, and to sojourn among us. — The Epistle of Barnabas, Chapter VI John Cassian : Quite obviously all this teaches us that the first good stirring of the will in us comes under the Lord's inspiration. He brings us along the road to salvation, either himself or by way of the exhortation of some person or through necessity. And our virtues are perfected also as a gift from him. Our task is, whether laxly or zealously, to play a role that corresponds to his grace, and our reward or our punishment will depend on whether we strove or neglected to be at one, attentive and obedient, with the kindly dispensation of his providence toward us. — CONFERENCE 3:19 John Cassian : In all these Scriptures there is a declaration of the grace of God and the freedom of our will, because even if by our own volition we can be led to the quest of virtue, we always stand in need of the help of the Lord. — CONFERENCE 13:9 Origen of Alexandria : This might lead one to suppose that it was God who gave the power to walk in his commandments and to keep his judgments, if it was he who removed the stony heart, which hindered them from keeping the commandments, and who implanted in them the better and more sensitive one, which is here called a heart of flesh. — ON FIRST PRINCIPLES 3:1.7 Origen of Alexandria : Now this is what is said by those who wish to prove by the authority of Scripture that nothing lies within our own power. We shall reply to them that these words must not be understood in that sense but as follows. It is as if an uneducated and uninstructed person becoming conscious of the disgrace of his condition, whether by being stirred at the exhortation of another or by a desire to rival those who are wise, should entrust himself to one by whom he is confident that he can be carefully trained and competently instructed. If then he, who had formerly hardened himself in ignorance, entrusts himself, as we have said, with full purpose of mind to a master and promises to obey him in everything, the master, on seeing clearly his purpose and determination, will on his part undertake to take away from him his lack of education and to implant in him education, not promising, however, to do this if the disciple withholds his assent and co-operation but only if he offers and pledges himself to entire obedience. — ON FIRST PRINCIPLES 3:1.15 Theodoret of Cyrus : He calls it a new heart, as a force in the soul for honorable things. When they are disposed to contrary things, they refer to a change toward better things as a new spirit. Just as he spoke of another heart and did not mean a change in nature, but a disposition towards better things, so this is shared through a new spirit. — COMMENTARY ON Ezekiel 3:11