Proverbs 30:16 KJB
A fire will burn as long as it is fed something that will burn. The fires of Hell will burn forever because God will merge it with the eternal lake of fire. Revelation 20:14 (KJB). God created the earth with a fire in it. Hell is the spiritual aspect of that fire. When God cast Satan to earth, he gained control of Hell, and he uses it to torture the souls and spirits of humans who die in their sins. Luke 16:23 (KJB). God also created the earth with vast, dark caves and huge seas of water underneath. For this reason, Hell has three regions of death which are called outer darkness or Death, the Sea, and a burning Hell. Revelation 20:13 (KJB). Hell is often used as a generic term for all three regions. When humans die in their sins, Christ must consign their dirty souls and spirits to one of these three regions of death according to how they lived their lives on the earth. Hebrews 9:27 (KJB).
Satan tortures these dirty souls and spirits because He hates God and anything God creates. Satan also aims to inflict so much pain and horror on these living souls and spirits created by God that he causes them to become totally evil and demonic and lost from God's Love forever. Job 2:9 (KJB). But all of God's living souls and spirits are forever alive in His sight. Luke 20:38 (KJB). In the end of the world, Christ will visit His living souls and spirits that belong to Him, and He will cause them all to repent and return to faith in Him as their Savior. Revelation 5:11-14 (KJB). He will then use His fiery wrath against evil to dissolve their beings to separate their repentant, living souls and spirits from their dead and evil natures so that He can save their living natures for Him to recreate with new bodies to live forever on His recreated earth, and He will cast their dead and evil natures into the eternal lake of fire. Revelation 5:11-14; II Peter 3:9-13; Psalm 75:3; Matthew 13:36-43; Revelation 21:1-5 (KJB).
When Christ rose from the dead, He abolished eternal death itself, not any of His living humans who are forever alive in His sight. Luke 20:38; II Timothy 1:10; I Corinthians 15:26 (KJB). Christ tasted death for every human which means He turned the eternal death of every human into only a temporary death. Hebrews 2:9 (KJB). Jesus satisfied His Father that He had successfully borne the sins, evil, and eternal deaths of every human on the cross. I John 2:2 (KJB). When He resurrected, Jesus gained control over the keys to Hell and death. This fact gives Him the right to enter Hell in the end of the world and liberate all of His living souls and spirits that are trapped there. Revelation 1:17-18 (KJB).
When God casts Hell and death into the eternal lake of fire, that will be the formal ending of that which Jesus has already accomplished. Revelation 20:14 (KJB). The first death is only temporary, but the second death is the eternal death of all sins, evil, death, and the Devil. Revelation 21:8 (KJB).
The lake of fire happens to be an objective creation of God's eternal, fiery wrath against evil which is a part of His eternal Being. Deuteronomy 32:22; Hebrews 12:29; II Peter 3:9-13 (KJB). Everything that God creates begins in Him, goes out from Him, and eventually comes back to Him. Ecclesiastes 3:14; Romans 11:36 (KJB). God can forever feed the lake of fire because He has Infinite Power. Psalm 147:5 (KJB).