Against the Belief of Those Who Think that the Sins Which Have Been Accompanied with Almsgiving Will Do Them No Harm
But this deliverance, which is effected by one's own prayers, or the intercession of holy men, secures that a man be not cast into eternal fire, but not that, when once he has been cast into it, he should after a time be rescued from it. For even those who fancy that what is said of the good ground bringing forth abundant fruit, some thirty, some sixty, some an hundred fold, is to be referred to the saints, so that in proportion to their merits some of them shall deliver thirty men, some sixty, some an hundred—even those who maintain this are yet commonly inclined to suppose that this deliverance will take place at, and not after the day of judgment.
Under this impression, some one who observed the unseemly folly with which men promise themselves impunity on the ground that all will be included in this method of deliverance, is reported to have very happily remarked, that we should rather endeavor to live so well that we shall be all found among the number of those who are to intercede for the liberation of others, lest these should be so few in number, that, after they have delivered one thirty, another sixty, another a hundred, there should still remain many who could not be delivered from punishment by their intercessions, and among them every one who has vainly and rashly promised himself the fruit of another's labor.
But enough has been said in reply to those who acknowledge the authority of the same sacred Scriptures as ourselves, but who, by a mistaken interpretation of them, conceive of the future rather as they themselves wish, than as the Scriptures teach. And having given this reply, I now, according to promise, close this book.
Source: City of God (New Advent)