Five lines, one flower, and a question that nobody in the poem answers. Emily Dickinson starts with a claim that sounds backwards: a flower "So gay" that it "Bereaves the Mind / As if it were a Woe." In her day "gay" meant bright, showy, merry, so the flower is the very picture of cheerfulness. Yet it works on the mind like a loss. "Bereaves" is a heavy verb, the one we use for being robbed of someone by death. The poem never says what the mind loses. Judging by the wording, it might be its calm, or its ability to take brightness at face value, but the poem leaves that gap open.
The fourth line turns the observation into a puzzle: "Is Beauty an Affliction -- then?" "Affliction" belongs to the vocabulary of illness and suffering, so beauty is being treated almost like a condition that can be caught. The small word "then" makes the speaker sound as if she is reasoning aloud, reaching a strange conclusion from the evidence of the first three lines and not quite trusting it. The last line hands the problem on: "Tradition ought to know." That can be read two ways. It may be sincere, since a long human record of poets and preachers must have noticed that beauty and sorrow keep company. Or it may be dry, even teasing: if Tradition has had all this time, why hasn't it settled the matter? The phrase "ought to" holds both possibilities, and the poem doesn't choose.
The shape of the poem helps this uncertainty along. The lines grow and then shrink. The first two are about four syllables each ("So gay a Flower" has four or five, depending on how you say "Flower"), the third has six, the fourth stretches to eight, and the last drops back to six. The sentence swells as the thought gets bigger, and the longest line is the one that carries the question. The rhythm is mostly iambic and steady enough to feel almost like a chant, which makes the odd idea sound calm and reasonable. The rhyme is sparing. Only "Woe" and "know" chime, in lines three and five. The lines between them (Flower, Mind, then) rhyme with nothing, so they dangle. The one pairing that does land links sorrow with knowing, and it quietly suggests that to understand something may be to grieve over it.
Dickinson's typography adds to the effect. Flower, Mind, Woe, Beauty, Affliction and Tradition all carry capital letters, which raises a garden plant and a mental state to the same rank as grand abstractions. The dashes work as small hesitations. The one after "Woe" lets the comparison hang a moment before the question arrives, and the one before "then" makes the speaker pause before she dares the conclusion. The poem as printed here even ends on a dash instead of a full stop. The final claim, that Tradition knows, trails off unfinished, as though the answer is still on its way, or may never come.
Dickinson lived in Amherst, Massachusetts, and wrote an enormous number of short poems, most of them unpublished in her lifetime. This one shows why the form suited her. In five lines she takes the most familiar subject in poetry, a flower, and makes it a problem. We expect a bright blossom to cheer us, and the poem admits that it can do the opposite. It also refuses the easy move of explaining why. A reader might think of how quickly a flower fades, or of how brightness can make an unhappy mind feel its own gloom more sharply. The poem gives no hint of which, and the open ending lets readers bring their own answer.
What makes the poem worth reading is that mix of confidence and doubt. It speaks in neat, hymn-like lines, yet what it says is uneasy. It asks a real question about whether beauty is a gift or a wound, and it ends by making the reader, and Tradition too, do the thinking.