What do lines 40 to 46 in the poem "Mending Wall" by Robert Frost mean?explain each line please.

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susan3smith eNotes educator| Certified Educator

Line 40 finishes a sentence that was begun in Line 36.  It describes the neighbor who is compared to an "old-stone savage armed," as he lifts a stone and places it on top the wall.  Yet, it is not just this action that makes him like a "stone savage"; it is also his inability or refusal to question tradition, unlike the speaker who questions the need for a wall.  Thus, the neighbor "moves in darkness" (line 41), most likely the darkness of ignorance.  We know the "darkness" is metaphorical because the speaker says the darkness is not only of woods or "of shade of trees" (line 42).  The speaker refuses to question his father's saying (line 43) ; in fact he enjoys recalling this saying so much that he repeats it (line 44):  "Good fences make good neighbors" (line 45).  The latter line is paradoxical, because the neighbor is right.  The building of the walls does bring the two men together; but it also separates them.  This last line repeated twice (line 26 and line 45) in the poem is a counter to the speaker's line also repeated in the poem: "Something there is that doesn't love a wall"  (line 1 and line 35).