what is the lake of fire?

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rev 20:20 says that the devil will be cast into the lake of fire and tortmented day and night for ever and ever. if the devil were to be tortured for all eternity, god would have to preserve him alive, but the bible says that jesus will destroy him. (king james) the symbolic fiery lake represents the second death. this is not the death first mentioned in the bible - death because of adams sin - death from which one may be released by a resurrection. because the bible does not say that the lake of fire would release those in it, thr second death must mean another kind of death, an irreversiblr one. in what sense are those in the lake of fire tormented eternally? at times, to torment can mean to restrain someone. once when jesus con- fronted the demons(angels gone bad) they cried out: art thou come hither to torment us in the abyss before the time? so all those in the lake will suffer the torment of everlasting restraint, or the second death. if you have never heard of the lake of fire than you do lack accurate knowledge of god.