Damn
My guide led me gravely
  down dark smoky byways,
  
  The fire-lit chambers
  and sulphurous highways
  That wound through the plateaus
  where fallen souls dwell;
  
  The echoing agonized
  precincts of Hell.
  
  And just when I thought
  it was all I could bear
  And yearned for one breath
  of unsullied air,
  I noticed one region
  apart from the rest
  Where the torments just glimpsed
  put my soul to the test.
  
“Pray tell me,” I begged him, 
“Who could be so cursed?
  For of all of the damned
  these are surely the worst!”
  
  He followed my glance,
  then blanched, turned away,
  For a time as I followed
  no further would say.
  
  Then:  “Those monsters,” he muttered,
  avoiding my looks,
“Wrote in the margins of library books.”