Thel is the one daughter who will not join the others. While her sisters lead their "sunny flocks" through the day, she goes alone to the river of Adona, hoping "to fade away like morning beauty." We are told of no cause for her grief. Nobody has died and nothing has been taken from her. She simply feels too slight to count for anything, and the poem asks what a creature like that can say to herself, and what the world can say back.
Thel's own speech is built almost entirely from similes, piled up one after another. She is "a watry bow," "a parting cloud," "a reflection in a glass," "shadows in the water," "music in the air." Each is something you can see or hear but never hold, and most are lovely, which is part of the trap. She doesn't call herself ugly or unwanted, only beautiful and unreal. The drifting "like... like... like" rhythm carries her toward her wish, and the wish arrives in the softest word in the poem. "Gentle" appears five times in her opening passage, and four of them fall in two lines: "gentle may I lay me down and gentle rest my head. / And gentle sleep the sleep of death, and gently hear the voice / Of him that walketh in the garden in the evening time." The last phrase recalls the Garden of Eden. Death becomes a tucking-in and a meeting with God, and the repeated word sands every edge off it.
The Lily's reply picks up Thel's vocabulary and gives it roots. Thel was a "watry bow"; the Lily is "a watry weed," so small that a butterfly "scarce perches" on her. Yet she is "visited from heaven," and each morning a divine hand is spread over her. Smallness, she says, is exactly what heaven notices. She promises light, "morning manna," and a flourishing in "eternal vales" after summer's heat "melts thee." The comfort has an odd edge, since melting is part of the offer. Her closing questions ("why should Thel complain") are kind, but they never touch what Thel actually said.
Thel's answer is a generous inventory of everything the Lily does. Her breath feeds the lamb, who crops her flowers "while thou sittest smiling in his face." Her perfume "revives the milked cow, & tames the fire-breathing steed." A small hint of unease slips in here, because the lamb needs to be wiped clean "from all contagious taints," so even this valley has something to be cleansed of. The more clearly Thel sees purpose in others, the emptier her own life looks: "I vanish from my pearly throne, and who shall find my place." Her fear is less of dying than of leaving no trace, with nobody able to point to where she was. Even her jewelled words, "pearly throne" and "silver shrine," sound pretty and cold, like things behind glass.
The ending is quietly cruel. The Lily doesn't answer; she passes the question on ("ask the tender cloud"). When the cloud descends she bows her "modest head" and goes off "to mind her numerous charge." The one with work to do walks away from the one without any. Thel is left face to face with a cloud, the very thing she compared herself to.
The form fits this unresolved mood. The lines are long, loose, unrhymed, and often run to about seven beats. They sound closer to chanted biblical verse than to a tidy song. With no rhyme to click shut at the end of a line, nothing in the sound ever settles, which suits an argument that never lands. The single short line, "She ceasd & smild in tears, then sat down in her silver shrine," interrupts the flow and holds smiles and tears together in a few words.
The poem's lasting interest lies in how seriously it treats a small, soft voice. The Lily's view, that worth comes from giving and belonging to a chain of care, is appealing, and the poem lets it stand. It also lets Thel's doubt stand beside it, with no verdict. The title's "Part I" tells us this is only an opening, but the text stops where Thel's question is still open. That is why readers keep coming back to it.