In just three short lines, the poem gives us a glimpse of a moment in church: a spot of red on someone's shoulder, and then the reveal that it is a single rose. The speaker seems to be sitting or standing among other people, quietly noticing, and what catches the eye is not a sermon or a ritual but a small, bright detail.
The title, "Devotional," shapes how we read that detail. A rose on a shoulder could be a pinned flower, a bit of fabric, or something else the poem doesn't spell out, but the title suggests that the act of noticing is itself a kind of devotion. Attention becomes a form of prayer. The dash before "one rose" works like a pause, the instant when the eye recognizes what it has been looking at.
The mood is hushed, tender, and still. There is no grand statement, only the sense that something beautiful can interrupt a quiet room, and that paying attention to it matters.