Doris Plenn (and Pete Seeger) also seem to be responsible for any connection people may make with "Civil War tumult." The verse about tyrants and prison cells is hers, not Lowry's.
A simple hymn of happy faith is badly distorted by this verse.

The verses in Phillips (Masato link) are exactly Lowry's. Whether written in 1860 or published in 1969 (was there an earlier printing?), the song quickly became popular, "My Life Flows On In Endless Song" a common title.

The song book published by the Unitarians, repeats the Quaker song attribution. "Singing the Living Tradition," Unitarian Universalist Association, 1993, Hymn # 108.

Haruo (a member of Mudcat) has an Esperanto version in Himnaro Cigneta. He gives midis for both the Lowry and Sankey tunes.

In "The Luthran Book of Worship, it is # 781 ("My Life...," attribution?)