Psalm 21:9 KJB
Psalm 21:8 informs as to exactly who God will cast into the lake of fire in the end of the world. God will cast only those who hate Him into the eternal lake of fire.
God creates every human in His image to be good. Genesis 1:31; Genesis 1:26-27 (KJB). Whenever humans sin, the Devil plants spiritual death inside of them which causes them to also become evil. Genesis 2:17; Genesis 3:15 (KJB). Inside of every human there exists the "seed" of the woman which is goodness and the image of God. The perfect "seed' of the woman is the Savior who is pure and holy, and therefore, He is able to save all of His good and living humans from the spiritual death that the Devil has injected into them. The "seed" of the Devil is spiritual death which the Devil hopes will utterly destroy the good and living natures of humans. Whenever humans sin, and especially if they commit evil acts, their good natures become influenced by their evil natures so that they try to find some good in their sin, or they try to excuse their sin. God punishes sin and evil because of its influence on human goodness, but He also sacrificed Himself and rose from the dead to save them all from eternal death. Christ abolished death itself, not any of His living humans. II Timothy 1:10; Luke 20:38 (KJB).
The good and living natures of humans will become nasty when influenced by sin and evil. Isaiah 64:6 (KJB). But the good and living natures of humans can never hate God, because if they did, then they would become totally evil and demonic, and God would lose a part of His creation that He loves to the Devil forever. God can never lose anything He has ever created, and His Love can never fail. Ecclesiastes 3:14; I Corinthians 13:8 (KJB). This fact can only mean in the end of the world, Christ will cast only those who hate Him, which are their spiritual deaths, into the lake of fire. Psalm 21:9 (KJB). Christ will visit all of His living humans "on the earth, and under the earth," and He will cause them all to repent and return to faith in Him as their Savior so that He can use His fiery wrath against evil to dissolve their beings to separate their repentant, good and living natures, for Him to recreate, from their dead and evil natures who hate Him, for Him to cast them into the eternal lake of fire. Psalm 75:3; Revelation 5:11-14; Revelation 20:11-15; Matthew 12:31-32; Matthew 13:36-43; I Corinthians 3:11-15; Luke 3:16-17; Luke 3:6 (KJB).
God will punish sin and evil, but He knows exactly how to cleanse and forgive the sins and evil of every one of His good and living humans. He will cleanse and forgive every human whom He saves by His grace with the blood of Jesus the moment they repent and believe. I John 1:7 (KJB). He will use His fiery wrath against evil to cleanse and forgive the rest of His living humans when He visits them in the end of the world, and He causes them to repent and return to faith in Him as their Savior. The sin offerings and the burnt offerings in the Old Testament symbolize these two forms of salvation. Isaiah 1:18; Genesis 3:20-21; Genesis 8:20-21; Leviticus 5:10; Revelation 5:11-14; Matthew 13:36-43; I Corinthians 3:11-15; Luke 3:16-17; Luke 3:6; II Peter 3:9-13 (KJB).
Jesus promised that His Father will root up every plant which He did not plant. That fact can only mean that God will save every plant, such as the "seed" of the woman, that He ever plants. Matthew 15:13 (KJB). That verse alone can only mean that God will save every living human that He ever creates. Christ promised, "Behold, I make all things new." Since Christ creates all things, then He must reconcile all of His living humans to Himself. Revelation 21:5; Revelation 4:11; Colossians 1:15-23 (KJB). Christ exists as the Savior of all men. Christ cannot exist as the Savior of all men unless He actually saves all men. I Timothy 4:10 (KJB). No one should add anything to that verse.