Then perhaps, it is time(past time) to tear down that building,( brick by brick if needed) in order to build another. This time it can be built upon The Rock.
This "age-during" definition for "eternal" (G166 aiōnios) is a MAJOR problem for Universalism.
It seems to be based on a handful of obscure translations (Youngs Literal translation, Concordant Literal translation, and Rotherham's translation), in which the translator took it upon themselves to insert "age-during" based on their theology instead of the ACTUAL Greek definition, which is eternal. This blundering move brings into question our eternal life and the eternal nature of God. Rather serious business, I would say. There are 68 uses of the word in the NT (KJV). So, this isn't an isolated problem.
The most obvious offender is in Matthew twenty-five, as indicated. Here below is the text in question. Here we see three uses of the word "eternal", all with the same definition in the Greek. Three things that are equally eternal: eternal fire, eternal punishment, and eternal life. So, if we claim that the "punishment" is not eternal, we also have to claim that eternal life is not eternal. But the Greek word definition does not support any of this conjecture. The problems don't end there, See below.
Matthew 25:41, 46
“Then he will say to those on his left, ‘Depart from me, you who are cursed,
into the
eternal fire prepared for the devil and his angels. ...
46 “Then they will go away to
eternal punishment, but the righteous to
eternal life.”
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What about the other 66 uses of the same Greek word that is defined as eternal? What else would not be eternal if we apply the claims of Universalism? Why wouldn't we also apply "age-during" to this description of the eternal God?
Romans 16:26
but now revealed and made known through the prophetic writings by the command of the
eternal God, so that all the Gentiles might come to the obedience that comes from faith—
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In this example our redemption would be "age-during". As if it had a planned obsolescence. (better check your warranty)
Hebrews 9:12
He did not enter by means of the blood of goats and calves; but he entered the Most Holy Place once for all by his own blood, thus obtaining
eternal redemption.
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I could continue, but I think you get the point.