Charlotte Smith's sonnet pictures a castaway on a barren island, watching the horizon for a ship. A cloud takes on the shape of a sail, raises his hopes, and dissolves, leaving him lower than before. The poem seems to be about him, but the last two lines turn it around. The speaker's own imagination, "delusive Fancy," plays the same trick on her, and her "feeble soul recoils" when reality returns. The central idea is that hope can wound as well as comfort. What hurts most is the near-presence of rescue, not the absence of it.
The sentence structure is the first clever thing here. The opening quatrain and the lines after it form one long sentence. Its subject, "The unhappy exile," arrives in line 1, but its verb, "may know," doesn't turn up until line 7. The reader is made to wait through the clauses about the isle, the harvests and the promontory, much as the exile waits for a ship. The comparison is also oddly reversed. We expect the speaker to say her grief is like an exile's. Instead, the exile "perhaps may know / Such heartless pain, such blank despair as mine." Her suffering is the standard, and the castaway is only an approximation of it.
The island is built from negatives and personification. It is "bleak," "unfriendly," "Cold, barren, desart" (an older spelling of desert), and the list piles up its adjectives without a single softening word. Even the land seems to refuse him: "no harvests smile," while "thirst and hunger on the rocks repine," as if his needs were complaining figures perched on the stones. The sea is "broad" and "shipless," a coined-sounding word that makes emptiness the sea's defining trait. Time passes in the phrase "Sun after sun he hopeless sees decline," where the repeated word and the inverted order stretch the line out, like days that all look the same.
The cloud is described in the language of deceit. It is "flattering," so it tells the exile what he wants to hear. It offers only "the fancied semblance of a distant sail," a likeness that exists partly in his own mind. Then it "melts away," and the rhyme of "sail" with "fail" shows how closely the hope and its collapse are linked. The phrase "the lost hope but aggravates his woe" is hard on the reader: "but" here means "only," so hope achieves nothing except extra pain.
The rhymes work in a similar way. The poem leans on a very small set of sounds. The *-ine* ending returns four times, in "confine," "repine," "decline" and "mine." That links the exile's confinement in line 1 with the speaker's ownership of the pain in line 8, so the word "mine" quietly takes over the word "confine." The *-ow* sounds form a short chain of their own: "know," "show," "woe." What is known and shown ends in woe. The meter is steady iambic pentameter, which gives the poem a controlled, sorrowing calm, and the feeling shows mainly in small interruptions: the exclamation "Ah!" and the dash in the last line.
That last couplet is where the poem's weight falls. After twelve lines of picture-making, the speaker takes only two to apply it to herself. "Toils" and "recoils" rhyme, but they point in opposite directions. Fancy works hard to build something, and the soul flinches away from what is true. The sail built by imagination is pulled apart by "contrasted truth," and the word "contrasted" suggests that hope's brightness only makes the real picture look darker.
The poem never says what the speaker has lost, or whether her own exile is literal or figurative. That silence is part of its strength, since the situation could belong to any reader who has hoped against the evidence. Its lasting interest lies in how precisely it describes that experience. It treats the imagination as both a comfort and a torment, and it shows how an apparent relief can leave the sufferer worse off.