Joy, in this poem, behaves like a shy and fickle visitor, and the speaker is the host who keeps getting stood up. Shelley addresses the "Spirit of Delight" as though it were a person who has walked out: "Wherefore hast thou left me now / Many a day and night?" The opening line, "Rarely, rarely, comest thou," turns the complaint into a sigh, the repeated adverb stretching out the gaps between visits. Everything that follows is a small campaign to win Delight back. Underneath it lies a painful paradox: the people who most need happiness are the ones it avoids.
The campaign starts with accusation. Delight, the speaker says, saves its company for "the joyous and the free" and "will scoff at pain." The stanza closes on a bitter little couplet: "Spirit false! thou hast forgot / All but those who need thee not." The next stanza gives the most precise image in the poem. Delight shrinks from sorrow "as a lizard with the shade / Of a trembling leaf," a creature so skittish that the faintest shadow sends it darting away. Even "the sighs of grief" reproach Delight, but it "wilt not hear."
Then the speaker tries trickery. If Delight comes only "for pleasure," not "for pity," he will dress his sadness up: "Let me set my mournful ditty / To a merry measure." The stanza ends on an unsettling thought, that pity might "cut away / Those cruel wings, and thou wilt stay." The wings are "cruel" because they carry Delight off, and the wish to clip them reveals how desperate the speaker has become. One could even read the poem itself as the disguised ditty. Its short, falling lines, mostly trochaic, and its tidy rhyme scheme (each six-line stanza rhymes ababcc, with the soft double rhymes of "ditty/pity" and "measure/pleasure" in the fourth) give a light, almost dancing surface to a very sad request.
At the halfway point the strategy changes again, from complaint and trickery to persuasion. The line "Spirit of Delight!" returns word for word, now rhyming with "starry night" instead of the earlier "many a day and night," and the repeated "I love" begins to build a case: we share the same tastes. The list moves from "fresh Earth in new leaves dressed" and "the morn / When the golden mists are born" to snow, "radiant frost," "waves, and winds, and storms." That these tastes include harsh weather as well as gentle scenes makes the speaker's love sound more genuine than sentimental. The qualifier "Everything almost / Which is Nature's" is an honest touch, and the hope that Nature may be "Untainted by man's misery" shows what the speaker is really fleeing. In the seventh stanza the argument almost closes its own gap: "Between thee and me / What difference?" The answer is modest. Delight simply possesses "the things I seek," which he does not "love them less."
The last stanza brings back the wings, this time attached to Love itself, which "like light can flee." That is the poem's quiet admission that everything the speaker adores is the kind of thing that leaves. The final couplet drops argument altogether: "Thou art love and life! Oh, come, / Make once more my heart thy home." The phrase "once more" implies Delight has lived there before, so the speaker is pleading from memory as well as longing. Notably, Delight never answers. The poem ends on a request still hanging in the air.
Part of what makes the poem memorable is how plainly it handles a hard truth: happiness can't be summoned by need, and sorrow itself seems to scare it off. Shelley, one of the major Romantic poets, speaks to an abstract spirit as to a living being, yet the language stays simple and direct, and the shifts from blame to cunning to tenderness make the speaker's feelings seem real. The poem is a song of failed persuasion, and its honesty about that failure gives it its force.