Do you even have the slightest concept of eternity?
Nobody does.
And the bible rarely mentions it. It does talk about “ages” Aion and Aionas in Koine Greek, or olam in Hebrew. We often will interpret that in our english translations to be eternity, forever, etc., even when it was sometimes clear that the event was most definitely not “eternal”.
I see eternity more as a place than a length of time. I see i as “heaven” or “the real world” outside this construct we occupy.
But there is a discussion of it here: http://jewishnotgreek.com/