"I believe every word that the Bible says about the lake of fire; I don’t believe what Rome says about it, nor what the church systems of man say about it, nor what tradition says about it, nor what Chuck Johnel says about it; but I certainly believe what the Bible says about it!"
"One would think that the lake of fire was a prominent theme throughout the scriptures from the book of Genesis to the book of Revelation. It is not. The fact is that the teaching concerning the lake of fire and brimstone does not appear anywhere in scripture except in the book of Revelation, the book with the most signs, symbols, and metaphors of any book in the entire Bible. If the book of Revelation had not been given us we would have no knowledge of the lake of fire at all. The Revelation speaks of the lake of fire five times."
Much more in the link:
FIRE" is the heat and light that you feel and see when something burns. It takes heat to start a fire, but once the fire is started it produces heat that keeps the process going. Thus, fire is really heat and light. In my study of the lake which burns with fire and brimstone I was very much impressed and helped by the understanding given by Charles Pridgeon and I would like to quote from his scholarly work on the subject of brimstone. He says, "The Lake of Fire and Brimstone signifies a fire burning with brimstone; the word ‘brimstone’ or sulphur defines the character of the fire. The Greek word theion translated ‘brimstone’ is exactly the same word theion which means ‘divine.’