Henry Wadsworth Longfellow

In the long, sleepless watches of the night,
  A gentle face--the face of one long dead--
  Looks at me from the wall, where round its head
  The night-lamp casts a halo of pale light.
Here in this room she died; and soul more white
  Never through martyrdom of fire was led
  To its repose; nor can in books be read
  The legend of a life more benedight.
There is a mountain in the distant West
  That, sun-defying, in its deep ravines
  Displays a cross of snow upon its side.
Such is the cross I wear upon my breast
  These eighteen years, through all the changing scenes
  And seasons, changeless since the day she died.