For grief thereof, and devilish despite,
  From his infernal furnace forth he threw
  Huge flames, that dimmed all the heavens' light,
  Enrolled in duskish smoke and brimstone blew;
  As burning Aetna from his boiling stew
  Doth belch out flames, and rocks in pieces broke,
  And ragged ribs of mountains molten new,
  Enwrapped in coalblack clouds and filthy smoke,
That all the land with stench, and heaven with horror choke.

The heat whereof, and harmful pestilence
  So sore him noyd, that forced him to retire
  A little backward for his best defense,
  To save his body from the scorching fire,
  Which he from hellish entrails did expire.

Book I, Canto XI