In the garden of Eden, man was sinless, sin had no place, had no power and was merely a concept, unrealized. Yet when man sinned, death took control and as an act of mercy, God allowed man to live for only a certain length of time and then be committed to the grave. We understand this to be an act of mercy, for if man was to live forever, he would literally be in hell. For he would continue living in the immediate presence of God, yet unable to die, would continue under the domination of sin with no means for escape.
As we move forward in time, Jesus has come, died and risen from the grave, having defeated death. Man now can live in the presence of God, free from the domination of sin and death is defeated, yet to be destroyed. When death is finally destroyed, those men who have used their time on earth to refine themselves, to fight against sin and to strive for holiness, they will be preparing themselves for a glorious eternity. But those men who waste their time, do not fight against the influence of sin and enter eternity, embodied, yet not striving after holiness, will endure a literal hell, for eternity. This state will be the state in which man would have been, had God not introduced the mercy of death. But at this point in time, death will have been destroyed, and those men who have not taken advantage of the resurrection of Christ, of the church as a hospital and of the power and direction of the Holy Spirit to prepare for an eternity with Christ, will suffer an eternity in eternal life, yet despising the very glory of God, who fills all things.