Read it through once

-- St. 13. The idea is involved in this stanza that the soul’s continued existence is dependent on its development in this life; the ironic character of the stanza is indicated by the merely intellectual subjects named, physics, geology, mathematics, which do not of themselves, necessarily, contribute to SOUL-development. All from the 2d verse of the 12th stanza down to “Dust and ashes” in the 15th, is what the music, “like a ghostly cricket, creaking where a house was burned”, says to the speaker, in the monologue, of the men and women for whom life meant simply a butterfly enjoyment.