Three short lines, and a small, still scene: rain falls on a table, and someone eats a single meal without any fuss. The title, "Guest," quietly changes how we read it. Who is the guest? It could be the speaker, who seems to be enjoying a simple supper alone. It could also be the rain, which lands on the table like a visitor sharing the meal. The poem doesn't say, and that open question is part of its charm.
The speaker feels calm and at home. "Great ease" suggests no hurry and no worry, just contentment in the moment. "The one supper" is a curious phrase. It might mean the only meal, or it might make this ordinary supper feel singular, worth noticing because it happens once. The rain on the table also suggests the meal is outdoors, or at least very close to the weather, which makes the scene feel open and unguarded. The mood is peaceful, humble, and quietly grateful.