"Hell exists as a final possibility, but several of the Fathers have none the less believed that in the end all will be reconciled to God. It is heretical to say that all must be saved, for this is to deny free will; but it is legitimate to hope that all may be saved."
Metropolitan Kallistos Ware (Greek Orthodox Church)

"When the Church says that hell exists, it means that the definitive rejection of God’s love is a real possibility. 'Hell' or 'Gehenna' are spatial metaphors for the lonely and sad condition of having definitively refused the offer of the divine life. Human free will necessitates the existence of hell inasmuch as any one human being may freely choose to definitively and irrevocably reject God."
Bishop Robert Barron (Roman Catholic Church)