I emailed the question in the OP to a Roman Catholic friend who believes in UR (I know that may seem an oximoron to some, but he mantains that the Catholic Church has never dogmatically defined the meaning of “eternal” and “everlasting” in reference to punishment), and received this rather lenthy reply.
[size=150]There is a problem with quoting single verses and then claiming that if they use the same word, or as here, phrase, they necessarily mean the same thing. The word ‘eternal’ or the phrase ‘forever and ever’ most certainly do not have the same meaning in every context, as a simple concordance study will show.
For example, look at Genesis 17: 1 - 14 (highlighting with bold print is mine):
And after he began to be ninety and nine years old, the Lord appeared to him: and said unto him: I am the Almighty God: walk before me, and be perfect. And I will make my covenant between me and thee: and I will multiply thee exceedingly. Abram fell flat on his face. And God said to him: I AM, and my covenant is with thee, and thou shalt be a father of many nations. Neither shall thy name be called any more Abram: but thou shalt be called Abraham: because I have made thee a father of many nations. And I will make thee increase exceedingly, and I will make nations of thee, and kings shall come out of thee. And I will establish my covenant between me and thee, and between thy seed after thee in their generations, by a perpetual covenant: to be a God to thee, and to thy seed after thee. And I will give to thee, and to thy seed, the land of thy sojournment, all the land of Canaan for a perpetual possession, and I will be their God. Again God said to Abraham: And thou therefore shalt keep my covenant, and thy seed after thee in their generations. This is my covenant which you shall observe, between me and you, and thy seed after thee: All the male kind of you shall be circumcised: And you shall circumcise the flesh of your foreskin, that it may be for a sign of the covenant between me and you. An infant of eight days old shall be circumcised among you, every man child in your generations: he that is born in the house, as well as the bought servant shall be circumcised, and whosoever is not of your stock: And my covenant shall be in your flesh for a perpetual covenant. The male, whose flesh of his foreskin shall not be circumcised, that soul shall be destroyed out of his people: because he hath broken my covenant.
NOTE: I have quoted the Douay Rheims version above which uses the word ‘perpetual’. The Vulgate reads aeternam; the Septuagint reads aionios; and the Hebrew says olam, which the King James Version correctly renders ‘everlasting.’ What all these terms have in common is both an absolute and an indefinite sense of duration; with respect to God the sense is absolute, as in Genesis 21: 33: Abraham planted a grove in Bersabee, and there called upon the name of the Lord God eternal. But in the passage above, although the same word is used, we must necessarily understand the relative or indefinite use of ‘everlasting.’ From our standpoint in the history of salvation we see clearly that the possession of the land of Canaan and the necessity of circumcision as the sign of the covenant was not perpetual or everlasting in the absolute sense, but only in the relative sense: lasting a long but indefinite period of time, the limits of which are determined solely by God, whose covenant it is.
In general, an adjective or adjectival phrase takes its meaning from the word which it modifies. Applying ‘eternal’ to God can only mean eternal in the absolute sense. Applying ‘eternal’ or ‘forever and ever’ to the life which Christ died to give us is likewise absolute because the very nature of that life is union with Jesus Christ who is the co-eternal Son of God made man for our salvation. But applying the same absolute sense to the adjectival phrase ‘forever and ever’ to the torments of the damned is an error; only the relative and indefinite sense can apply here.
Why is this? Because if one applies the absolute sense of ‘eternal’ to the torments of the damned, one makes impossible of fulfillment the many passages throughout the Bible which clearly teach universal reconciliation. (Click on the link for a long list of such passages.)
For the sake of this discussion I’d like to hone in on Apocalypse/Revelation 20 in a more comprehensive and less fundamentalistic manner:
And there came down fire from God out of heaven, and devoured them; and the devil, who seduced them, was cast into the pool of fire and brimstone, where both the beast and the false prophet shall be tormented day and night for ever and ever.
Continuing on in the same chapter we read:
And I saw a great white throne, and one sitting upon it, from whose face the earth and heaven fled away, and there was no place found for them. And I saw the dead, great and small, standing in the presence of the throne, and the books were opened; and another book was opened, which is the book of life; and the dead were judged by those things which were written in the books, according to their works. And the sea gave up the dead that were in it, and death and hell gave up their dead that were in them; and they were judged every one according to their works. And hell and death were cast into the pool of fire. This is the second death. And whosoever was not found written in the book of life, was cast into the pool of fire.
Note well that the pool of fire is called ‘the second death.’ Those held captive in hell and death are at the general judgment cast into the pool or lake of fire which is the second death.
But does the second death last forever in the absolute sense, co-eternal with the everlasting kingdom of God? This cannot be. For if the second death were of equal duration with the kingdom of God, then death at its most terrible will reign forever and ever without end! Yet it is precisely this which St Paul assures us will not be:
But now Christ is risen from the dead, the firstfruits of them that sleep: For by a man came death, and by a man the resurrection of the dead. And as in Adam all die, so also in Christ all shall be made alive. But every one in his own order: the firstfruits Christ, then they that are of Christ, who have believed. Afterwards the end, when he shall have delivered up the kingdom to God and the Father, when he shall have brought to nought all principality, and power, and virtue. For he must reign, until he hath put all his enemies under his feet. And the enemy death shall be destroyed last. (1 Corinthians 15: 20 - 26.)
Now there are several ways that universal reconciliation is stated here: As in Adam all die, so also in Christ all shall be made alive. Note the all… all. We’re not dealing with an adjective here but a noun: All those who in Adam have been subject to death shall be made alive in Christ. Yet not all at once, but in three distinct ranks or orders:
1.) ‘Christ the First-fruits’ when he rose on the third day;
2.) Then ‘those who have believed’ at the time of his coming.
3.) Finally ‘the rest’ of those who have been subject to death. This is translated ‘the end’ but a commonly documented usage means the remainder, the rest, and that usage fits best here.
Now if the remainder of mankind subject to death in Adam is to be made alive in Christ along with those who have believed (although in a distinct rank), how could the second death, being tormented in the lake of fire, be eternal in the absolute sense of that word? In that case death would reign eternally and never be destroyed, canceling out what St Paul declared: And the enemy death shall be destroyed last.
However, if we put this declaration of St Paul in an overlay pattern with St John’s statement that being cast into the lake of fire is the second death, it becomes clear that the second death shall be destroyed as the final enemy, and all its inhabitants - Satan and his angels, the Antichrist and his false prophet, and all the wicked, having been punished according to their works - all shall be brought to life in Christ, having finally and freely chosen to be reconciled. Then, as St Paul triumphantly says:
For he hath put all things under his feet. And whereas he saith, All things are put under him; undoubtedly, he is excepted, who put all things under him. And when all things shall be subdued unto him, then the Son also himself shall be subject unto him that put all things under him, that God may be all in all.[/size]