Anyone who has felt relief arrive and then watched it dissolve will recognise the situation here. The speaker admits she has "many times thought Peace had come / When Peace was far away." Her central insight is that the feeling of peace is an unreliable witness. Hope keeps producing counterfeits, and the poem measures a long struggle by the number of them. It never says what kind of peace is meant, whether calm of mind, spiritual rest or something final, and that silence lets the image carry the whole weight.
That image is a shipwreck. "Wrecked Men" at the "Centre of the Sea" are as far from land as anyone can be, yet they "deem they sight the Land." The verb matters. To deem is to judge or decide, not simply to see, so the men are half-creating what they believe, because they need it so badly. The consequence is quietly cruel: they "struggle slacker." Believing they are saved, they ease their effort, and the illusion costs them strength. Then comes the turn. They slacken "but to prove / As hopelessly as I." The speaker has been waiting in the background, and now she becomes the yardstick. The sailors learn that they are as hopeless as she is, a surprising reversal, since we expect the narrator to compare herself to them.
The form is plain. Alternating lines of eight and six syllables, in a mostly iambic beat, give the familiar hymn or ballad measure that Dickinson often used. This makes the poem sound steady and almost sing-song, while the content is anything but. The rhyme is also unsettled. Only the second and fourth lines of each stanza are meant to chime, and the pairs are loose: "away" with "Sea," "I" with "be." Each ends on an open vowel and never quite clicks shut. One could read that as an echo of the poem's subject, a sound that seems to be arriving and doesn't. That is an interpretation, but the effect is real.
The dashes do similar work. Nearly every line ends on one, so the thought never settles into a full stop. Even the final line, "Before the Harbor be --", ends on a dash instead of a period, and the poem stays at sea.
The last two lines are the most compressed. "How many the fictitious Shores" has no verb and no question mark. It reads as a sigh or an exclamation more than a question. "Fictitious" is also an unusually formal, Latinate word among so many short, plain ones. It sounds like a cool accountant's term, as if the speaker has learned to catalogue her own disappointments, and it suggests the shores are made up by the mind and not misjudged by the eye. Then there is "Before the Harbor be." The subjunctive "be" is old-fashioned, but it does something important, because it assumes the Harbor exists. The poem is not pure despair. To count false shores is to believe there is a true one, even if the speaker never says she will reach it.
The capital letters give the poem a quiet allegorical weight. Peace, Land, Shores and Harbor read almost like named places on a map of the inner life, and Peace itself "comes" like a visitor who turns out not to be at the door. Emily Dickinson lived in Amherst, Massachusetts, and most of her poems went unpublished in her lifetime. Her habit of packing a whole experience into a few short lines is on full display here, with eight lines, one metaphor and one reversal.
What makes the poem significant is its honesty about hope. Many poems about suffering promise arrival, and many deny it outright. This one describes the middle, where you have been fooled before, will probably be fooled again, and still cannot stop scanning the horizon. Its comfort is slight but genuine: the false shores are at least evidence of distance travelled, and the Harbor is still allowed to exist.