God does not punish arbitrarily for the sake of “payback”(imo), He punishes to correct. Whatever post-mortem “aionian kolassis/aionian pyr”(Mt 25) is, it is symbolized by fire(jesus called it aionian fire).
Jesus’ eyes are as flames of fire. Every person is salted with fire. Our God is a consuming fire. God is love. God is light and in Him there is no darkness at all. Light is fire to darkness and if anyone hates his brother he is “in darkness still”- so love is light and fire, and it consumes all enmity until there is only love, communion, union, harmony- in the “all in all”.
I gather that some do not believe in post-mortem correction because of the ramifications in the “fulfilled view”, so I am not really speaking to that. I understand that- but from my view, Gehenna and the lake of fire are symbolic of being immersed in light, in such a way that every secret thing is brought to light(Rom 2 on the Day where God will judge the secrets of men by Jesus Christ… 1 Cor 3 every mans work will be tested by fire for the day shall reveal it).
The Day shall reveal it by fire. Light is fire to darkness. The body that is destroyed is not(imo) referring strictly to the flesh body. Gehenna is symbolic of, for instance Rev 14:10 -tormented with fire and brimstone in the presence of the holy angels and the Lamb. Every eye will see Him even those who pierced Him…“Hide us from the presence of the Lamb and the one on the throne”.
All these images speak to the fact that God is setting the whole creation free from futiltiy, chaos, tohu and bohu(without form and void) by the new creation, which the fulness of God that was in Christ filling all things until God is all in all. The One who dwells in unapproachable light will draw all into that light until all darkness is excavated, exposed and dissolved by the glory of His presence. "If I am lifted up from the earth(Christ crucified- the perfect message of love) I will draw all men unto me.
“The light shines in the darkness and the darkness cannot overcome it.”
In Peter 2 the apostle speaks of this…"For if God did not spare angels when they sinned, but cast them into hell(tartaroo) and committed them to pits of darkness, reserved for judgment;… the Lord knows how to rescue the godly from temptation, and to keep the unrighteous under punishment for the Day of judgment…
But in the next chapter 2 Peter 3 speaks of the stoiceon(elementary principles) being “dissolved”(lysethetai) to be replaced by a “new heavens and a new earth” in which “righteous dwells”- the all in all(imo) of the fulness of light.
God is patient not wishing that anyone perish, but that all come to repentance(the condition that opens the door for the fulness of light.
All “fire” is for the purpose of restoration to fulness of light, however and whenever it is applied.
But because of your stubbornness and unrepentant heart you are storing up wrath for yourself in the day of wrath and revelation of the righteous judgment of God, 6who WILL RENDER TO EACH PERSON ACCORDING TO HIS DEEDS: 7to those who by perseverance in doing good seek for glory and honor and immortality, eternal life; 8but to those who are selfishly ambitious and do not obey the truth, but obey unrighteousness, wrath and indignation. 9There will be tribulation and distress for every soul of man who does evil, of the Jew first and also of the Greek, 10but glory and honor and peace to everyone who does good, to the Jew first and also to the Greek. 11For there is no partiality with God.Ro 2
In Gehenna, or the “lake of fire” a divine intervention will take place, light shall shine of of darkness to reval the “Light of the knowledge of the glory of God in the face of Christ.”
The veil of flesh will be rent and the gold will be separated from the lower elements by “fire”(the light of His presence) and all will “come to their senses”.
And the Lord’s servant must not be quarrelsome but kind to everyone, able to teach, patiently enduring evil, correcting his opponents with gentleness. God may perhaps grant them repentance leading to a knowledge of the truth, and they may come to their senses and escape from the snare of the devil, after being captured by him to do his will.