Augustine of Hippo, on Ezek 11:19

“And I will give them one heart, and will put a new spirit in their bowels: and I will take away the stony heart out of their flesh, and will give them a heart of flesh:”

“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.”

Imported from an open dataset — not yet checked against the printed edition.