What is the central idea of mending wall?

The speaker wonders whether he and his neighbor really need a wall to separate their rural and well-defined properties, but his neighbor insists they do.

The speaker thinks his neighbor is misguided in his views of the purpose of walls and fences.  

Explanation:

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in the quotation from passage, connie willis states that literature is a way for authors from the past to communicate with readers of today. we can read their stories, books, and other texts to learn lessons about life. willis refers to these lessons as messages “from beyond the grave.” willis has a favorable viewpoint about the timelessness of literature.