In Augustine's view this entailed the notion that though fallen man still has a free will in the sense that he retains the faculty of choosing, the will is fallen and enslaved by sin to such an extent that man does not have moral liberty. He cannot not sin. After this struggle passed, modified views of Pelagianism returned to haunt the church. These views were called semi-Pelagianism. Semi-Pelagianism admitted to a real Fall and a real transfer of Original Sin to the progeny of Adam.
Man is fallen and requires grace in order to be saved.
However, this view says we are not so fallen that we are left totally enslaved to sin or totally depraved in our nature. An island of righteousness remains in fallen man by which the fallen person still has the moral power to incline himself, without operative grace, to the things of God. Though the ancient church condemned semi-Pelagianism as vigorously as it had condemned Pelagianism, it never died out. In the sixteenth century the magisterial reformers were convinced that Rome had degenerated from pure Augustinianism and fallen into semi-Pelagianism. It was not an insignificant detail of history that Luther himself was a monk in the Augustinian Order.