Based on this excerpt, from "Mending Wall", by Robert Frost, the speaker most likely think about the wall that he knows that it is of no use to mend it.
The narrator is not sure about mending the wall, but the neighbor repeats his father's words and traditions 'Good fences make good neighbors', and acts in consequence. His neighbor thinks that mending the wall is being practical and doesn't want to hear the narrator's opinion against its utility, and grabs two stones 'like an old-stone savage' to repair the wall.
