Six lines, one sentence, and the main verb arrives only at the final word. Stevenson makes the reader wait through a list of people and a sweep of faraway scenery before revealing what the speaker is actually doing: "dedicate." It reads like an inscription, the sort of thing a writer puts at the front of a book, yet it holds a surprising amount of feeling. It conveys the ache of distance and a stubborn promise not to let that distance turn into forgetting.
The central idea is loyalty across space. Everything rests on the contrast between "friends at home" in the first line and the "pinnacle of distances" in the fifth. Home is never described; it exists only as the people who live in it. Distance, by contrast, is painted: a "blue horizon" and "green isles." The poem doesn't tell us whether these are beautiful or lonely, so we feel both. Judging by the imagery, the speaker is on an island looking out over the sea. Stevenson did spend his last years in Samoa, so it is tempting to read the poem against that life, but the text itself names no place.
The way the friends are listed rewards a slow look. The first line gives three descriptions, "the lone, the admired, the lost," and the sound of the first and last (lone, lost) bends the line toward sadness, with "admired" sitting between them like a respectful bow. "Lost" is deliberately open. It might mean dead, or simply out of reach. Then the net widens to cover all of life: "the gracious old, the lovely young." The poem turns ages into months, so that youth is "May" and old age is "December," and then makes a quiet distinction. May is "the fair" and December is "the beloved." One is praised for how it looks, the other for how it is held in the heart. That is an inference, but the pairing is too neat to be accidental. By naming the extremes, the speaker suggests that he means everyone, from spring to winter.
Sound and rhythm carry much of the feeling. There is no rhyme, which keeps the voice close to speech, formal but unforced. The lines are loosely iambic, and the second and fourth ("The gracious old, the lovely young, to May"; "These from my blue horizon and green isles") run almost like regular pentameter. But the third and sixth lines are noticeably shorter, as if the voice gives out. "December the beloved" is left hanging, and the poem ends on a short, hushed phrase. Without a rhyme to click shut, the weight falls on the last words themselves.
The syntax does its own work. "These from my blue horizon and green isles, / These from this pinnacle of distances" repeats "These" like a hand placing one gift after another. The poem never says what "these" are, but in a dedication they are presumably the writings that follow. Then comes the line break after "I." The speaker is stranded for a moment at the end of the line, alone on his peak, before the poem adds the words "The unforgetful." The word is slightly unusual, and the choice is telling. He doesn't say "I remember" or "I miss you." He describes himself by the negative of a failure, which hints at how easy forgetting might be when so much sea lies between. The faithfulness has to be chosen.
What makes the poem significant is how much it does without saying so. A dedication is usually the most throwaway part of a book, and here it becomes a small, complete poem. It also shows restraint. There are no exclamations and no declared sorrow, only a long, patient sentence that carries affection across a great gap and puts down its verb at the last moment, like a letter finally reaching shore.