At the end of time, Albion awakes from his sleep and returns to Eden through rejection of error and illusion, according to Blake. There is no hell, for good and evil are the arbitrary laws of Urizen, given to Moses at Mount Sinai. The only hell is non-existence. When the Apocalypse occurs all error is destroyed and ceases to exist, and all the wandering souls of man trapped in Urlo and Generation return to Eden. Error is Created.
Truth is Eternal.
In Blake's cosmogony, though, eternal events simply exist eternally, and it is our own limited senses which see the world in terms of beginning and end. Eternity Exists, and All things in Eternity, Independent of Creation which was an act of Mercy. Although this world is an illusion of our fallen senses, and is the realm of the Satanic Urizen in his fallen state, it is not entirely evil, for it is an act of mercy by God to prevent Man's total annihilation. All the events of space and time exist as symbols of Eternal states.