There is only one God, who is righteous/just, and hell lasts until justice is accomplished.
Here is the way I connect the Scriptural dots to explain this. If it is foggy, please do not hesitate to ask for clarification.
The Bible teaches that God is justness or righteousness (Rom. 3:25-26, 9:14, 2Thes. 1:6). This doctrine is called theodicy. It means that we should be careful lest our explanations of God’s will seem unloving or unfair. If a person cannot explain how a loving God could order the execution of babies (Josh. 6:17, 8:2), then possibly He did not do so. Another synonym for justness is goodness (Isa. 5:16).
God is just (2Thes. 1:6a, cf. Rom. 3:25-26 & 9:14, Deut. 32:4, Psa. 36:6, Luke 11:42, Rev. 15:3). All explanations of reality and interpretations of Scripture should conform to this certitude: “The Lord is righteous in all his ways, and holy in all his works.” (Psa. 145:17) The Judge is just. It would be better not to attempt an explanation of God’s Word than to state one that impugns God’s justice and love for all people (Joel 2:13, John 3:16).
Even the wrath of God is an expression of His love. Hebrews 12:4-11 offers the clue for harmonizing these two themes. This passage indicates that divine wrath is intended as discipline: to teach people to repent of their hatefulness or faithlessness (Pro. 3:12, Isa. 33:14-15 Rev. 3:19) before they die, after which divine wrath will be experienced justly without the opportunity for repentance.
If a righteous explanation cannot be found for a passage, then it should be considered as historical or descriptive of what occurred rather than as pedagogical or prescriptive of how people should behave. Of course, because God is loving and just, He does not tempt, trick, confuse or otherwise contribute to anyone’s sinfulness. On the contrary, God must be doing all that He can do without abrogating justice or volition (MFW) to influence people not to be deceived and become self-condemned (Jam. 1:13-17, Tit. 3:11, Isa. 45:19).
MFW only exists when there is the possibility of choosing between two qualitatively opposite moral options that we call good and evil. These options are opposites because of essentially different consequences for choosing them. Choosing good results in blessing, life and heaven; and choosing evil results in cursing, death and hell (Deut. 30:19). This is why hell as well as heaven exists. It is the just consequence for choosing evil rather than God.
The Spirit of God is good: love, peace and joy (Gal. 5:22-23). Therefore, whoever rejects the Lord is spiritually separated from Him (Isa. 59:2) and thereby chooses the evil or satanic spirit of hatred, strife and misery and reaps the just consequence called “hell” in the afterlife (Gal. 6:7-9, Heb. 9:27-28). These options were presented by Moses to the Israelites (DT 30:19), and Jesus referred to this fundamental choice in terms of a fish or egg versus a snake or scorpion (Luke 11:11-13). Life… or Curse? (Gen. 3:24, Rev. 22:1-2)
God created theoretical evil or the possibility of rejecting Him as an option that actualizes MFW/free human personality. As such it is necessary and even good (Gen. 1:31). Of course, it was wrong for Satan (1John 3:8) and humanity (Rom. 5:12) to make evil actual by choosing to Sin or reject Faith in God’s Lordship. The first people to choose the evil option were named Adam and Eve (Gen. 3:6). Sin: ignoring God/God’s Word.
God loves a cheerful giver (2Cor. 9:7), which means He desires people to cooperate with Him happily because of love and gratitude for His grace rather than to cower before Him because of fear of hell. Love must be evoked; it cannot be coerced. And again, when souls sin or do NOT choose to love God freely, it is perfectly just (loving and logical) for them to reap the appropriate consequence (Gal. 6:7-9) or hell.
Evil people punish/torture themselves by experiencing delayed karma, just as those who experience appropriate justice during this earthly existence also punish themselves or reap what they have sown and send themselves to jail. This view makes souls responsible for breaking the rules rather than blaming evil on the judges (or Judge) who enforce the rules. The purpose of earthly punishment is to promote repentance, but the reason for retribution in hell is to attain justice.
It is difficult to imagine, but somehow even someone as evil as Hitler will receive perfect justice, perhaps experiencing the agony of the millions of deaths he caused in accordance with the principal of “eye for eye” (Matt. 5:38), after which their souls are destroyed forever (per John 17:12, Rom. 9:22, Gal. 6:8, Phil. 3:19, 2Thes. 1:9, 2Pet. 3:7 & Rev. 20:13-14).
