As with many of Frost's poems, physical objects (in this case, the wall) are symbols for something larger, something about human psychology or interpersonal relationships. Frost's favorite objects to employ in this way are those from Nature. Birch trees, stars, and tiny bugs all make appearances on Robert Frost's poetic stage. Despite that symbolic role Nature often plays in Frost's poems, the features of Nature he uses are not just poetic devices. Although the poet's main concern is humans, he is also interested in a right attitude toward Nature. There is thus in the poems an actual connection between humans and Nature, not an artificial linking. In Frost's poems, Nature, when viewed in the right way, is frequently able to be a real guide for human behavior. Nature can be a true reference point. It has lessons to teach.
For example, in the poem "Mending Wall" that the frequently quoted line comes from, the speaker cites Nature -- in the form of expanding, frozen ground -- as the cause of the wall's continually falling apart:
"Something there is that doesn't love a wall,
That sends the frozen-ground-swell under it,..."
The wall made of piled boulders, if it is to be maintained, requires mending every year not because it was poorly built but because it defied Nature. The neighbor ("in darkness") seems to not be recognizing Nature's teaching that even the relatively solid earth will change. Nature is not only a source of order but also a source of the undoing of order.The contemporary Christian John Haught, from a theological perspective, raises a similar question. Citing Biblical passages such as God saying, "See, I am making all things new," (Rev. 21:5, NRSV), Haught asks: "Why should we think of God principally as a 'designer?' Isn't God also the source of novelty? And doesn't the introduction of novelty inevitably disrupt perfect design?"
The real trick is learning what features of Nature to cite when. When, as guidance, do I cite the stable features of Nature, and when do I cite the changing ones? I need to have knowledge not only of the non-human sphere of Nature but also of the human sphere -- understanding how we are both similar and dissimilar to the rest of the natural world. Knowing how to interpret the world thus calls for growing in wisdom.
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Is there any way you try to be guided by Nature? Any way you are inspired by it?
(The Haught quote is from Responses to 101 Questions
on God and Evolution by John F. Haught. © 2001. p. 87.)
(The entire Robert Frost poem can be read at this external link: "Mending Wall.")