Say not the law divine. Spiritual Law. Also from the Devotional Verses, 1826, p. 34, into various American hymnals, generally Unitarian, as the Hymn and Tune Book, Boston, 1868, No. 342, &c, where, however, it is rewritten from an irregular metre to S.M. This had previously appeared in Hedge and Huntington's Hymns for the Church of Christ, Boston, U.S., 1853.
-- Excerpt from John Julian, Dictionary of Hymnology (1907)