Under the title "Revolutionary romantic," the poem pictures a crowd rising up, a multitude, and treats the sight as a kind of medicine. The speaker says it "has been a salve / for the heart." That word suggests the heart is sore or worn down, and the sight of so many people standing together soothes it.
The feeling isn't loud or triumphant. The poem compares this comfort to something "simple / as rain in the woods," a quiet, natural image that makes the uprising seem less like a battle and more like something growing and alive. Rain in the woods is gentle and renewing, and it needs no argument to justify it.
The last lines turn toward doubt. There is "more in it than any / weary answer," as if the speaker has heard plenty of tired explanations for why nothing changes and rejects them. The mood is tender and hopeful, but with a slight weariness underneath, like someone choosing to trust in possibility.