About that "furnace of fire"

The enemy that sowed them is the devil; the harvest is the end of the world; and the

reapers are the angels. As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world. The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.

Matthew 13:39-42

"How repugnant to every emotion of love and mercy, and even to our sense of justice, is the doctrine that the wicked dead are tormented with fire and brimstone in an eternally burning hell; that for the sins of a brief, earthly life they are to suffer torture as long as God shall live.....But He will destroy them utterly and cause them to be as if they had not been; then His justice will be satisfied. He formed man out of the dust of the earth, and the disobedient and unholy will be consumed by fire and return to dust again." 

E.G.W.