：Something there is that doesn・t love a wall,； so we can know that ：something； is against the wall. I think ：something； could be one person・s natural instincts. This is because, in my opinion, the wall is like a boundary between two persons. It is an invisible barrier among people. Because the invisible barrier, sometimes we don・t have complete trust in others. We also can・t know what・s in other・s minds. In this way, the relationship among people will be less and less close. In fact, we don・t want this kind of situation to happen, so our natural instincts also don・t like the invisible barrier, the wall, at all. ： That sends the frozen-ground-swell under it,； we know the ground will expend with heat and contract with cold. This is a natural phenomenon. I think maybe even the ground also don・t like the wall.
：The work of hunters is another thing:
I have come after them and made repair
Where they have left not one stone on a stone,；
After reading these lines, we can know the hunters damage the walls. I think it is because the hunters will find animals easily without the walls, the shelters; therefore, the hunters are against the walls. The neighbour said that good fences make good neighbours. I think because the wall is an obvious boundary, it makes the neighbour feel comfortable and has a sense of security. Beside the concrete boundary, the neighbour also wants an invisible wall. He doesn・t confide in others, so he needs a ：wall； to protect himself.
：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 offence.
I suppose the speaker is against the wall, because he is not sure to whom he was like to offence. If people treat others sincerely, the relationship among people will be good. The speaker doesn・t know why a person need a ：wall； to protect himself or why a person builds up an invisible wall so that others can・t realize him entirely.
：He said it for himself. I see him there
Bringing a stone grasped firmly by the top
In each hand, like an old-stone savage armed.
He moves in darkness as it seems to me,；
I guess the speaker thinks his neighbour is simple minded and primitive, and he is a like barbarian. This is because the speaker uses ：savage； and ：darkness.； It makes feel that the neighbour only has great strength but nothing else at all.
I know that Robert Frost is a phenomenal poet with great inspiration, so he uses the wall as a symbol. It represents not only the concrete boundary but also an invisible barrier among people. I think he uses a good symbolism. By the way, I don・t know in this poem why spring is both a time for mending, and creating mischief in the speaker.