So asks the Orthodox bishop, Kallistos Ware. In his work The Inner Kingdom, he dares to ask the question. Ware is not a squishy theologian. He is thoroughly traditional and Orthodox in all points. But he is expressing a true and I think orthodox hope.
He mentions that St. Gregory of Nyssa also had such hopes. Ware says,
“Gregory [writes], ‘the wickedness which is now mingled and consolidated with our nature has been finally expelled from it, and when all those things that are now sunk down in evil are restored to their original state, there will ascend from the entire creation a united hymn of thanksgiving…All this is contained in the great mystery of the Divine Incarnation.’ This final restoration, Gregory clearly states, will embrace even the devil.”
Ware does not deny the existence of hell, he only questions the purpose for it. Is it a place of condemnation and judgment, or does it have a restorative or healing element to it? Is the fire of God wrathful or is it remedial? Ware is not trying to presume that God’s purpose will eventually win out to save everyone, he is only expressing a hope and a sincere prayer.