In drear-nighted December
Too happy, happy tree
Thy branches ne'er remember
Their green felicity:
The north cannot undo them
With a sleety whistle through them;
Nor frozen thawings glue them
From budding at the prime
In drear-nighted December
Too happy, happy brook
Thy bubblings ne'er remember
Apollo's summer look;
But with a sweet forgetting
They stay their crystal fretting
Never, never petting
Apollo  was said to be the god of sun and light in Greek mythology.