There are qualities--some incorporate thing
  That have a double life, which thus is made
A type of that twin entity which springs
  From matter and light, evinced is solid and shade.
There is a twofold Silence--sea and shore --
  Body and soul. One dwells in lonely places,
  Newly with grass o'ergrown; some solemn graces,
Some human memories and tearful lore,
Render him terrorless; his name's "No More."
He is the corporate Silence: dread him not!
  No power hath he of evil in himself;
But Should some urgent fate (untimely lot!)
  Bring thee to meet this shadow (nameless elf,
That haulteth the lone regions where hath trod
No foot of man), command thyself to God!

by Edger Allen Poe