Analysis of Once For All

I said: This is a beautiful fresh rose.
I said: I will delight me with its scent,
Will watch its lovely curve of languishment,
Will watch its leaves unclose, its heart unclose.
I said: Old earth has put away her snows,
All living things make merry to their bent,
A flower is come for every flower that went.
In autumn, the sun glows, the south wind blows,
So walking in a garden of delight
I came upon one sheltered shadowed nook
Where broad leaf-shadows veiled the day with night
And there lay snow unmelted by the sun: -
I answered: Take who will the path I took,
Winter nips once for all; love is but one.