A dungeon horrible, on all sides round,
As one great furnace flamed; yet from those flames
No light; but rather darkness visible
Serv'd only to discover sights of woe,
Regions of sorrow, doleful shades, where peace
And rest can never dwell, hope never comes
That comes to all, but torture without end.
MILTON: Par. Lost, Bk. i., Line 61.