When the hounds of spring are on winter's traces,
  The mother of months in meadow or plain
Fills the shadows and windy places
  With lisp of leaves and ripple of rain;
And the brown bright nightingale amorous 
Is half assuaged for Itylus,
For the Thracian ships and the foreign faces.
  The tongueless vigil, and all the pain.

 ... 

For winter's rains and ruins are over,
  And all the season of snows and sins;
The days dividing lover and lover,
  The light that loses, the night that wins;
And time remember'd is grief forgotten,
And frosts are slain and flowers begotten,
And in green underwood and cover
  Blossom by blossom the spring begins.