On the Grace of Christ, and on Original Sin

I also have read those books or writings of his which he mentions in the letter which he sent to Pope Innocent, of blessed memory, with the exception of a brief epistle which he says he sent to the holy Bishop Constantius; but I have nowhere been able to find in them that he acknowledges such a grace as helps not only that “natural capacity of willing and acting” (which according to him we possess, even when we neither will a good thing nor do it), but also the will and the action itself, by the ministration of the Holy Ghost.