Analysis of To write one song, I said

To write one song, I said,
As sad as the sad wind
That walks around my bed,
Having one simple fall
As a candle-flame swells, and is thinned,
As a curtain stirs by the wall
— For this I must visit the dead.
Headstone and wet cross,
Paths where the mourners tread,
A solitary bird,
These call up the shade of loss,
Shape word to word.

That stones would shine like gold
Above each sodden grave,
This, I had not foretold,
Nor the birds' clamour, nor
The image morning gave
Of more and ever more,
As some vast seven-piled wave,
Mane-flinging, manifold,
Streams at an endless shore.