1.Why are the last two lines of the following poem put within brackets?

2. What does the poet try to convey in the last two lines?

The Voice of the Rain
By Walt Whitman

And who art thou? said I to the soft-falling shower,
Which, strange to tell, gave me an answer, as here translated:
I am the Poem of Earth, said the voice of the rain,
Eternal I rise impalpable out of the land and the bottomless sea,
Upward to heaven, whence, vaguely form'd, altogether changed, and
yet the same,
I descend to lave the drouths, atomies, dust-layers of the globe,
And all that in them without me were seeds only, latent, unborn;
And forever, by day and night, I give back life to my own origin,
and make pure and beautify it;
(For song, issuing from its birth-place, after fulfilment, wandering,
Reck'd or unreck'd, duly with love returns.)
As it is not the part of the conversation.
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1. The last two lines are written in brackets because those two lines are the thought of the poet, while the entire poem talks about what the rain is saying. So to differentiate it the lines are in the brackets.

2. In the last two lines the poet has compared the rain to a song, which tells its beginning which is from the earth, through the whole water cycle after which it falls back on the earth.
as the last two lines..are poet.. opinion..they r put within brackets..
The last 2 lines are the after thoughts of the poet and hence are written in brackets
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What do you mean by impalpable?