Will ye believe
The wonders of the ocean? how its shoals
Sprang from the wave, like flashing light;.. took wing,
And, twinkling with a silver glitterance,
Flew through the air and sunshine? yet were they
To sight less wondrous than the tribe who swam,
Following like fowlers, with uplifted eye,
Their falling quarry:.. language cannot paint
Their splendid tints! though in blue ocean seen,
Blue, darkly, deeply, beautifully blue,
In all its rich variety of shades,
Suffus'd with glowing gold.

Madoc in Wales, Part I, Sec. V - 48 (1805). Compare: "'Darkly, deeply, beautifully blue,' As some one somewhere sings about the sky", Lord Byron, Don Juan, canto iv. stanza 110.