Nicene and Post-Nicene Fathers, Vol. V:
A Treatise on the Merits and Forgiveness...: Chapter 47

Chapter 47 [XXIX.]—All the Predestinated are Saved Through the One Mediator Christ, and by One and the Same Faith.

This being the case, ever since the time when by one man sin thus entered into this world and death by sin, and so it passed through to all men, up to the end of this carnal generation and perishing world, the children of which beget and are begotten, there never has existed, nor ever will exist, a human being of whom, placed in this life of ours, it could be said that he had no sin at all, with the exception of the one Mediator, who reconciles us to our Maker through the forgiveness of sins. Now this same Lord of ours has never yet refused, at any period of the human race, nor to the last judgment will He ever refuse, this His healing to those whom, in His most sure foreknowledge and future loving-kindness, He has predestinated to reign with Himself to life eternal. For, previous to His birth in the flesh, and weakness in suffering, and power in His own resurrection, He instructed all who then lived, in the faith of those then future blessings, that they might inherit everlasting life; whilst those who were alive when all these things were being accomplished in Christ, and who were witnessing the fulfilment of prophecy, He instructed in the faith of these then present blessings; whilst again, those who have since lived, and ourselves who are now alive, and all those who are yet to live, He does not cease to instruct, in the faith of these now past blessings. It is therefore “one faith” which saves all, who after their carnal birth are born again of the Spirit, and it terminates in Him, who came to be judged for us and to die,—the Judge of quick and dead. But the sacraments of this “one faith” are varied from time to time in order to its suitable signification.