Analysis of O Nightingale! Thou Surely Art

O Nightingale! thou surely art
A creature of a "fiery heart":--
These notes of thine--they pierce and pierce;
Tumultuous harmony and fierce!
Thou sing'st as if the God of wine
Had helped thee to a Valentine;
A song in mockery and despite
Of shades, and dews, and silent night;
And steady bliss, and all the loves
Now sleeping in these peaceful groves.
I heard a Stock-dove sing or say
His homely tale, this very day;
His voice was buried among trees,
Yet to be come at by the breeze:
He did not cease; but cooed--and cooed;
And somewhat pensively he wooed:
He sang of love, with quiet blending,
Slow to begin, and never ending;
Of serious faith, and inward glee;
That was the song -- the song for me!