What is the Lake of Fire?
The Bible book of Revelation defines the figurative phrase "lake of fire" as "second DEATH," not torture in a flame; and, death is an unconscious state. I will quote the two scriptures that define "the lake of fire;" and also, two that define what death means. After the scriptures, we will consider what the word "second" death means.
Revelation 20:14-15 (New American Standard Bible)
14 Then death and Hades were thrown into the lake of fire THIS IS THE SECOND DEATH, the lake of fire.
15 And if anyone's name was not found written in the book of life, he was thrown into the lake of fire.