Resignation

Why, why repine, my pensive friend,
  At pleasures slipp'd away?
Some the stern Fates will never lend,
  And all refuse to stay.I see the rainbow in the sky,
  The dew upon the grass;
I see them, and I ask not why
  They glimmer or they pass.With folded arms I linger not
  To call them back; 'twere vain:
In this, or in some other spot,
  I know they'll shine again.