Two small creatures carry this whole poem. The bee is cautious. It hovers around the rose, wanting its sweetness but afraid "lest danger lurk within." The moth is reckless and spirals toward a candle flame until it burns. The first stanza asks the reader two questions, "Hast thou not seen...?" and "Hast thou not marked...?", as if we'd watched both scenes on a summer evening. The second stanza reveals why. The speaker's heart has behaved like both insects, creeping closer to the person he loves, held back by fear and pulled forward by longing. The central idea is that desire is dangerous and tempting at once, and that a lover can be as timid as the bee and as doomed as the moth.
The title and subtitle tell us the stanzas come from Calderón's play about England's schism, "translated by Medwin and corrected by Shelley." So the English is a shared piece of work, and the text doesn't tell us which words belong to whom. It still stands on its own as a compact love poem built on a single extended comparison.
The form is tidy. Each stanza has eight lines of mostly iambic pentameter, rhymed ABABABCC, with a closing couplet. Those couplets matter. In the first stanza the pair is "fire" and "pyre," and the moth's story ends in death. In the second it is "close" and "Rose," and the lover's story ends on the flower. The rhymes in the second stanza also link ideas. "Came," "flame" and "Shame" share a sound, so passion and embarrassment are tied together before the sense says so.
The imagery keeps blurring the line between flower and fire. The bee fears to drink the rose's "purple light," as if the petals gave off a glow, and the moth flies through "illumined air." By the time the candle appears as a "monumental fire," a word that suggests a tomb or memorial, the two dangers have started to merge. The moth's "sunflower wings" are presumably golden, and the flower image is turned into fuel, since the wings "kindle" into their "own funereal pyre." The moth is both victim and builder of its own funeral.
The second stanza moves from the garden to the inside of the lover. Distrust becomes "Passion's slave," smothering the flame "in ashes cold," but the fire survives. Then come the poem's most interesting phrases. "Love, that grows by disappointment bold" is a paradox, because setbacks make this lover braver. Beside it, "Opportunity" sounds almost businesslike, as if shame gave way because a chance happened to turn up. The sentence is also built to delay its payoff. "Till Love... and Opportunity, had conquered Shame" stretches across several lines, and the lover only arrives at the rose in the final one. The reader hovers as the speaker does.
That last line is the poem's quiet masterstroke: "I burned my wings, and settled on the Rose." It is almost entirely monosyllabic, plain and fast after all the build-up. It also combines the two insects. Burning wings belong to the moth, and settling on the rose belongs to the bee. The lover has both been damaged and arrived. The word "settled" is gentle, even contented, which makes the line hard to read as pure disaster. It may be a price worth paying, or it may be a calm that only looks like victory. The poem doesn't say, and that open question is where its tension lies.
Some lines sit inside quotation marks in the text supplied, and the poem doesn't explain why. Even so, the stanzas read as a complete small drama: observation, confession, then a final act. Their interest lies in how much they pack into sixteen lines. They set an old image, the creature drawn to what may hurt it, against the very human problem of being too scared to speak. The conceit is fully worked out, the structure carries the speaker from hesitation to action, and the ending leaves room for both hope and regret.