I am currently reading B.B. Warfield's essay, "Augustine and the Pelagian Controversy." It is a goldmine. At one point he is discussing how a recently-elected pope, one Zosimus, may have been a bit soft on Pelagianism. Pelagius and one of his followers, Coelestius, had been condemned, but Zosimus was letting them off the hook. A number of African bishops gathered and pronounced that Pelagius and Coelestius should continue to be considered out of bounds theologically. They were to be considered out of bounds until they could affirm the following:
"we are aided by the grace of God, through Christ, not only to know, but to do what is right, in each single act, so that without grace we are unable to have, think, speak, or do anything pertaining to piety."
B.B. Warfield, "Augustine and the Pelagian Controversy," in Studies in Tertullian and Augustine, 303.