I don't just mean lost spiritually, I mean lost cognitively. I mean you can't see the forest for the gracious trees that are in the way.
Matthew is the only synoptic gospel writer to use this phrase anyway, Mark and Luke talk of the πῦρ τὸ ἄσβεστον (pur to asbeston) - the fire that cannot be put out. It is not the fire that cannot go out (when deprived of fuel). This is the majority view in the gospels, and equally expresses the incomprehensibility of the length of time that these fires have been burning, but does not actually express that they have been and always will be perpetually burning.
So you're gonna discredit Matthew because the other 3 didn't say it? Wow...
Implying that the fire is eternal, when paired with the scripture from Matthew, also implies that the punishment is eternal as well as the fire.
The fire of Hell will always burn....
Satan's Doom
7When the thousand years are over, Satan will be released from his prison 8and will go out to deceive the nations in the four corners of the earth—Gog and Magog—to gather them for battle. In number they are like the sand on the seashore. 9They marched across the breadth of the earth and surrounded the camp of God's people, the city he loves. But fire came down from heaven and devoured them.
10And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever.
The Dead Are Judged
11Then I saw a great white throne and him who was seated on it. Earth and sky fled from his presence, and there was no place for them. 12And I saw the dead, great and small, standing before the throne, and books were opened. Another book was opened, which is the book of life. The dead were judged according to what they had done as recorded in the books. 13The sea gave up the dead that were in it, and death and Hades gave up the dead that were in them, and each person was judged according to what he had done. 14Then death and Hades were thrown into the lake of fire. The lake of fire is the second death.
15If anyone's name was not found written in the book of life, he was thrown into the lake of fire.
Same lake, same fire, same torment. It's all there fellas.