Augustine of Hippo, on Ezek 36:26

“And I will give you a new heart, and put a new spirit within you: and I will take away the stony heart out of your flesh, and will give you a heart of flesh.”

“Free will is always present in us, but it is not always good. For it is either free of justice, while serving sin, and then it is evil; or it is free of sin, while serving justice, and then it is good. But the grace of God is always good and brings about a good will in a person who before was possessed of an evil will. It is by this grace, too, that this same good will, once it begins to exist, is expanded and made so strong that it is able to fulfill whatever of God's commandments it wishes, whenever it does so with a strong and perfect will.”

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