They are now rather famous: ...

To the dim street I led her sacred feet; And so the Daughter gave, Soft, moth-like, sweet, Showy as damask-rose and shy as musk, Back to her Mother, anxious in the dusk.
And now "Good Night!" Why should the poet speak of the girl in this way?
Why does he call her feet sacred?
She has just promised to marry him; and now she seems to him quite divine.

But he discovers very plain words with which to communicate his finer feelings to the reader.

The street is "dim" because it is night; and in the night the beautifully dressed maiden seems like a splendid moth--the name given to night butterflies in England.

In England the moths are much more beautiful than the true butterflies; they have wings of scarlet and purple and brown and gold.