Hail, sacred truth! whose piercing ray. [Missions]. This hymn in the American Methodist Episcopal Hymns 1849, 1879, and others, is given in Mason and Greene's Church Psalmody , 1831, as from the Evangelical Magazine. It is essentially different from the hymn "Hail, sacred truth, thou source of peace," in the Gospel Magazine, 1778, p. 55, and there signed "John Buttress."
--John Julian, Dictionary of Hymnology, Appendix, Part II (1907)