Augustine of Hippo

It is not in God's power that anyone should be forced against his will to do evil or good but that he should go to the bad, according to his own deserts, when God abandons him. For a person is not good if he does not will it, but the grace of God assists him even in willing. It is not without cause that it is written, "God is the one who works in you to will and do, of his own good will."