Swifter far than summer's flight—
  Swifter far than youth's delight—
  Swifter far than happy night,
  Art thou come and gone—
  As the earth when leaves are dead,
  As the night when sleep is sped,
  As the heart when joy is fled,
  I am left lone, alone. 
             
               The
                   swallow summer comes again—
  The owlet night resumes her reign—
  But the wild–swan youth is fain
  To fly with thee, false as thou. —
  My heart each day desires the morrow;
  Sleep itself is turned to sorrow;
  Vainly would my winter borrow
  Sunny leaves from any bough.                                 
  
                                     Percy
Bysshe Shelley