Robert Frost's use of a first-person speaker in "Mending Wall" is integral to developing the poem's central idea of differing perspectives on boundaries and relationships. The fact that readers are only provided with the speaker's feelings and perspective helps to stress the idea that he and his neighbor do not see things the same way.
Through the first-person narrative, readers gain insight into the speaker's thoughts and emotions, highlighting his ambivalence and questioning attitude toward the wall. While the speaker seems to view the wall as unnecessary—questioning the purpose of their separation—his neighbor adheres to the adage that "Good fences make good neighbors." This contrast underscores the poem's exploration of human relationships, boundaries, and the differing beliefs that shape them. By presenting the speaker's internal conflict and his relationship with the neighbor in such a personal manner, Frost deepens the complexity of the theme and invites readers to reflect on their own views about barriers, both physical and emotional.