He only says Good fences make good neighbors Spring is the mischief in me and I wonder.If I could put a notion in his head why do they make good neighbors? Isn't it where there are cows? But here there are no cows. Before I built a wall I'd ask to know what I was walling in or walling out. And to whom I was like to give offense. Which theme does this excerpt from the poem Mending wall express?

The excerpt from the poem "Mending Wall" expresses the theme of questioning the necessity and purpose of boundaries and division.