3 It is established beyond question that the Lord, after He had been put to death in the flesh, “descended into hell;” for it is impossible to gainsay either that utterance of prophecy, “You will not leave my soul in hell,” — an utterance which Peter himself expounds in the Acts of the Apostles, lest any one should venture to put upon it another interpretation—or the words of the same apostle, in which he affirms that the Lord “loosed the pains of hell, in which it was not possible for Him to be holden.” Who, therefore, except an infidel, will deny that Christ was in hell? As to the difficulty which is found in reconciling the statement that the pains of hell were loosed by Him, with the fact that He had never begun to be in these pains as in bonds, and did not so loose them as if He had broken off chains by which He had been bound, this is easily removed when we understand that they were loosed in the same way as the snares of huntsmen may be loosed to prevent their holding, not because they have taken hold. It may also be understood as teaching us to believe Him to have loosed those pains which could not possibly hold Him, but which were holding those to whom He had resolved to grant deliverance.
4. But who these were it is presumptuous for us to define. For if we say that all who were found there were then delivered without exception, who will not rejoice if we can prove this? Especially will men rejoice for the sake of some who are intimately known to us by their literary labours, whose eloquence and talent we admire—not only the poets and orators who in many parts of their writings have held up to contempt and ridicule these same false gods of the nations, and have even occasionally confessed the one true God, although along with the rest they observed superstitious rites, but also those who have uttered the same, not in poetry or rhetoric, but as philosophers: and for the sake of many more of whom we have no literary remains, but in regard to whom we have learned from the writings of these others that their lives were to a certain extent praiseworthy, so that (with the exception of their service of God, in which they erred, worshipping the vanities which had been set up as objects of public worship, and serving the creature rather than the Creator) they may be justly held up as models in all the other virtues of frugality, self-denial, chastity, sobriety, braving of death in their country's defence, and faith kept inviolate not only to fellow citizens, but also to enemies. All these things, indeed, when they are practised with a view not to the great end of right and true piety, but to the empty pride of human praise and glory, become in a sense worthless and unprofitable; nevertheless, as indications of a certain disposition of mind, they please us so much that we would desire those in whom they exist, either by special preference or along with the others, to be freed from the pains of hell, were not the verdict of human feeling different from that of the justice of the Creator.
5. These things being so, if the Saviour delivered all from that place, and, to quote the terms of the question in your letter, “emptied hell, so that now from that time forward the last judgment was to be expected,” the following things occasion not unreasonable perplexity on this subject, and are wont to present themselves to me in the meantime when I think on it. First, by what authoritative statements can this opinion be confirmed? For the words of Scripture, that “the pains of hell were loosed” by the death of Christ, do not establish this, seeing that this statement may be understood as referring to Himself, and meaning that he so far loosed (that is, made ineffectual) the pains of hell that He Himself was not held by them, especially since it is added that it was “impossible for Him to be holden of them.” Or if any one [objecting to this interpretation] ask the reason why He chose to descend into hell, where those pains were which could not possibly hold Him who was, as Scripture says, “free among the dead,” in whom the prince and captain of death found nothing which deserved punishment, the words that “the pains of hell were loosed” may be understood as referring not to the case of all, but only of some whom He judged worthy of that deliverance; so that neither is He supposed to have descended there in vain, without the purpose of bringing benefit to any of those who were there held in prison, nor is it a necessary inference that what divine mercy and justice granted to some must be supposed to have been granted to all.
Source: Letters (New Advent)