Henry Wadsworth Longfellow

Sadly as some old mediaeval knight
  Gazed at the arms he could no longer wield,
  The sword two-handed and the shining shield
  Suspended in the hall, and full in sight,
While secret longings for the lost delight
  Of tourney or adventure in the field
  Came over him, and tears but half concealed
  Trembled and fell upon his beard of white,
So I behold these books upon their shelf,
  My ornaments and arms of other days;
  Not wholly useless, though no longer used,
For they remind me of my other self,
  Younger and stronger, and the pleasant ways
  In which I walked, now clouded and confused.