What are some quotes and examples from "Thanatopsis" that help to establish the organic cycle in the poem?

The organic cycle of nature is something that is one of
the central themes of this poem, as thoughts of death are measured by the way that death
returns us to Nature that gave us birth in the first place. Note the role of Earth in
this process:

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Earth, that nourished thee, shall
claim

Thy growth, to be resolved to earth
again,

And, lost each human trace, surrendering
up

Thine individual being, shalt thou
go

To mix forever with the
elements,

To be a brother to the insensible
rock...

The image of what
happens to us when we die becomes clear. In death, the earth, which "nourished" us and
gave us life, claims us and we become "earth again," mixing with the elements and
becoming brother to nature, symbolised in the "insensible rock." Our individual being is
surrendered, but we are not alone, as "all that breathe" share this destiny. Death and
life is described therefore as a strictly organic process, as we are born and sustained
by nature and earth, and then return to it, becoming one with nature once again when we
die.