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This work describes, "Complaining brooks that make the meadows green," and advises, "Go forth under the open sky, and list to Nature's teachings." This poem claims that sometimes nature, "Has a voice of gladness, and a smile and eloquence of beauty," but at other times has a "still voice." The hope expressed in this poem is that the reader can,  "Approach thy grave, like one who wraps the drapery of his couch about him, and lies down to pleasant dreams."  Those last lines were added in 1821, after this work was published in North American Review. Identify this poem whose title means "sight of death", a work by William Cullen Bryant.
This work describes, "Complaining brooks that make the meadows green," and advises, "Go forth under the open sky, and list to Nature's teachings."
“Thanatopsis”