City of God, Book XXI
And therefore we may reasonably inquire how we are to understand these words of the Lord Jesus: “This is the bread which cometh down from heaven, that a man may eat thereof, and not die. I am the living bread which came down from heaven. If any man eat of this bread, he shall live for ever.” And those, indeed, whom we are now answering, are refuted in their interpretation of this passage by those whom we are shortly to answer, and who do not promise this deliverance to all who have received the sacraments of baptism and the Lord’s body, but only to the catholics, however wickedly they live; for these, say they, have eaten the Lord’s body not only sacramentally, but really, being constituted members of His body, of which the apostle says, “We being many are one bread, one body.” He then who is in the unity of Christ’s body (that is to say, in the Christian membership), of which body the faithful have been wont to receive the sacrament at the altar, that man is truly said to eat the body and drink the blood of Christ. And consequently heretics and schismatics being separate from the unity of this body, are able to receive the same sacrament, but with no profit to themselves,—nay, rather to their own hurt, so that they are rather more severely judged than liberated after some time. For they are not in that bond of peace which is symbolized by that sacrament.
But again, even those who sufficiently understand that he who is not in the body of Christ cannot be said to eat the body of Christ, are in error when they promise liberation from the fire of eternal punishment to persons who fall away from the unity of that body into heresy, or even into heathenish superstition. For, in the first place, they ought to consider how intolerable it is, and how discordant with sound doctrine, to suppose that many, indeed, or almost all, who have forsaken the Church catholic, and have originated impious heresies and become heresiarchs, should enjoy a destiny superior to those who never were catholics, but have fallen into the snares of these others; that is to say, if the fact of their catholic baptism and original reception of the sacrament of the body of Christ in the true body of Christ is sufficient to deliver these heresiarchs from eternal punishment. For certainly he who deserts the faith, and from a deserter becomes an assailant, is worse than he who has not deserted the faith he never held. And, in the second place, they are contradicted by the apostle, who, after enumerating the works of the flesh, says with reference to heresies, “They who do such things shall not inherit the kingdom of God.”
And therefore neither ought such persons as lead an abandoned and damnable life to be confident of salvation, though they persevere to the end in the communion of the Church catholic, and comfort themselves with the words, “He that endureth to the end shall be saved.” By the iniquity of their life they abandon that very righteousness of life which Christ is to them, whether it be by fornication, or by perpetrating in their body the other uncleannesses which the apostle would not so much as mention, or by a dissolute luxury, or by doing any one of those things of which he says, “They who do such things shall not inherit the kingdom of God.” Consequently, they who do such things shall not exist anywhere but in eternal punishment, since they cannot be in the kingdom of God. For, while they continue in such things to the very end of life, they cannot be said to abide in Christ to the end; for to abide in Him is to abide in the faith of Christ. And this faith, according to the apostle’s definition of it, “worketh by love.” And “love,” as he elsewhere says, “worketh no evil.” Neither can these persons be said to eat the body of Christ, for they cannot even be reckoned among His members. For, not to mention other reasons, they cannot be at once the members of Christ and the members of a harlot. In fine, He Himself, when He says, “He that eateth my flesh and drinketh my blood, dwelleth in me, and I in him,” shows what it is in reality, and not sacramentally, to eat His body and drink His blood; for this is to dwell in Christ, that He also may dwell in us. So that it is as if He said, He that dwelleth not in me, and in whom I do not dwell, let him not say or think that he eateth my body or drinketh my blood. Accordingly, they who are not Christ’s members do not dwell in Him. And they who make themselves members of a harlot, are not members of Christ unless they have penitently abandoned that evil, and have returned to this good to be reconciled to it.
Chapter 26.—What It is to Have Christ for a Foundation, and Who They are to Whom Salvation as by Fire is Promised.
But, say they, the catholic Christians have Christ for a foundation, and they have not fallen away from union with Him, no matter how depraved a life they have built on this foundation, as wood, hay, stubble; and accordingly the well-directed faith by which Christ is their foundation will suffice to deliver them some time from the continuance of that fire, though it be with loss, since those things they have built on it shall be burned. Let the Apostle James summarily reply to them: “If any man say he has faith, and have not works, can faith save him?” And who then is it, they ask, of whom the Apostle Paul says, “But he himself shall be saved, yet so as by fire?” Let us join them in their inquiry; and one thing is very certain, that it is not he of whom James speaks, else we should make the two apostles contradict one another, if the one says, “Though a man’s works be evil, his faith will save him as by fire,” while the other says, “If he have not good works, can his faith save him?”
We shall then ascertain who it is who can be saved by fire, if we first discover what it is to have Christ for a foundation. And this we may very readily learn from the image itself. In a building the foundation is first. Whoever, then, has Christ in his heart, so that no earthly or temporal things—not even those that are legitimate and allowed—are preferred to Him, has Christ as a foundation. But if these things be preferred, then even though a man seem to have faith in Christ, yet Christ is not the foundation to that man; and much more if he, in contempt of wholesome precepts, seek forbidden gratifications, is he clearly convicted of putting Christ not first but last, since he has despised Him as his ruler, and has preferred to fulfill his own wicked lusts, in contempt of Christ’s commands and allowances. Accordingly, if any Christian man loves a harlot, and, attaching himself to her, becomes one body, he has not now Christ for a foundation. But if any one loves his own wife, and loves her as Christ would have him love her, who can doubt that he has Christ for a foundation? But if he loves her in the world’s fashion, carnally, as the disease of lust prompts him, and as the Gentiles love who know not God, even this the apostle, or rather Christ by the apostle, allows as a venial fault. And therefore even such a man may have Christ for a foundation. For so long as he does not prefer such an affection or pleasure to Christ, Christ is his foundation, though on it he builds wood, hay, stubble; and therefore he shall be saved as by fire. For the fire of affliction shall burn such luxurious pleasures and earthly loves, though they be not damnable, because enjoyed in lawful wedlock. And of this fire the fuel is bereavement, and all those calamities which consume these joys. Consequently the superstructure will be loss to him who has built it, for he shall not retain it, but shall be agonized by the loss of those things in the enjoyment of which he found pleasure. But by this fire he shall be saved through virtue of the foundation, because even if a persecutor demanded whether he would retain Christ or these things, he would prefer Christ. Would you hear, in the apostle’s own words, who he is who builds on the foundation gold, silver, precious stones? “He that is unmarried,” he says, “careth for the things that belong to the Lord, how he may please the Lord.” Would you hear who he is that buildeth wood, hay, stubble? “But he that is married careth for the things that are of the world, how he may please his wife.” “Every man’s work shall be made manifest: for the day shall declare it,”—the day, no doubt, of tribulation—“because,” says he, “it shall be revealed by fire.” He calls tribulation fire, just as it is elsewhere said, “The furnace proves the vessels of the potter, and the trial of affliction righteous men.” And “The fire shall try every man’s work of what sort it is. If any man’s work abide”—for a man’s care for the things of the Lord, how he may please the Lord, abides—“which he hath built thereupon, he shall receive a reward,”—that is, he shall reap the fruit of his care. “But if any man’s work shall be burned, he shall suffer loss,”—for what he loved he shall not retain:—“but he himself shall be saved,”—for no tribulation shall have moved him from that stable foundation,—“yet so as by fire;” for that which he possessed with the sweetness of love he does not lose without the sharp sting of pain. Here, then, as seems to me, we have a fire which destroys neither, but enriches the one, brings loss to the other, proves both.