I just read these 2 excellent books by George Sarris.
The point of his books is that hell does not last forever. Eventually all of God's created beings will be made righteous and perfect as they were intended to be before the fall.
This is one of many scriptures that stand out.

Philippians 2:9-11
The Message
9-11 Because of that obedience, God lifted Him high and honored Him far beyond anyone or anything, ever, so that all created beings in heaven and on earth—even those long ago dead and buried—will bow in worship before this Jesus Christ, and call out in praise that he is the Master of all, to the glorious honor of God the Father.

Philippians 2:9-11
New International Version
9 Therefore God exalted Him to the highest place
and gave Him the name that is above every name,
10 that at the name of Jesus every knee should bow,
in heaven and on earth and under the earth,
11 and every tongue acknowledge that Jesus Christ is Lord,
to the glory of God the Father.