Heaven and the clue is prayer
Explanation:
It is evident that the poem's diction using the twilight wind turning a sleeve, means that the poet is juxtaposing himself against nature and his creator.
The heavy laden metaphor represents a road in the time of twilight which is gruesome.
So, the return back home is less elemental as the home and more ephemeral as the original home where the poet can return and no more burn and toil on the road of earthly life.
the emphasis on prayer (is all my prayer) confirms this.
