God gives us a description of the lake of fire as in fire and brimstone which can be used literal as in Sodom and Gomorrah burned to ashes and as a metaphor for torment, suffering, punishment or as Matthew 8:12 describes it as outer darkness. The New Testament description is a bottomless pit (abyss) (Revelation 20:3), a lake (Revelation 20:14), darkness (Matthew 25:30), death (Revelation 2:11), destruction (2 Thessalonians 1:9), everlasting torment (Revelation 20:10), a place of wailing and gnashing of teeth (Matthew 25:30), and a place of gradated punishment (Matthew 11:20-24; Luke 12:47-48; Revelation 20:12-13), everlasting fire Matthew 25:41, everlasting punishment, Matthew 25:46, lake of fire burning with brimstone.
In my own minds eye I see the lake of fire as a place where those who have rejected God, whether they be good or bad people, burning in a torment (fire and brimstone could be a metaphor for torment) of having to see those who have heard the call of God and have accepted Him and now live in a place of paradise with all the fullness of God in all His glory. No more tears, no more hurts, pain sickness, etc, etc. Those in the lake of fire are outside the realm of God continuing in all their sin, sickness, hurts, pain tears, etc. etc., but can see those who are in the glory of the Lord like looking through a window and wanting what others have, but will never have it and this is their torment for eternity as they are constantly consumed with the fire that burns in their souls for what they have rejected and now to late to receive.