And let me beg you to consider how he everywhere sets down these two points;His part, and our part. On His part, however, there be things varied and numerous and diverse. For He died for us, and farther reconciled us, and brought us to Himself, and gave us grace unspeakable. But we brought faith only as our contribution. And so he says," "by faith, unto this grace"What grace is this? tell me. It is the being counted worthy of the knowledge of God, the being forced from error, the coming to a knowledge of the Truth, the obtaining of all the blessings that come through Baptism. For the end of His bringing us near was that we might receive these gifts. For it was not only that we might have simple remission of sins, that we were reconciled; but that we might receive also countless benefits...A person has acquired rule and glory and authority, yet he does not stand therein continuously, but is speedily cast out of it. Or if man take it not from him, death comes, and is sure to take it from him. But God's gifts are not of this kind; for neither man, nor occasion, nor crisis of affairs, nor even the Devil, nor death, can come and cast us. out of them. But when we are dead we then more strictly speaking have possession of them, and keep going on enjoying more and more.
Homily 9 on Romans 4, 4th Century
Unless the grace of God comes to the help of our frailty, to protect and defend it, no man can withstand the insidious onslaughts of the enemy nor can he damp down or hold in check the fevers which burn in our flesh with nature's fire.
Conferences, Conference Two: On Discernment, Paulist Press pg. 74, 5th century