Peace of God, which knows no measure. [Peace of God.] These eight lines were given in the Unitarian Book of Hymns, Boston, U.S.A., 1846, as "Anonymous." It has been repeated in many hymnals to the present time, but its author has not been discovered. Line 5, usually given as the opening line of stanza ii. when the hymn is divided, is C. Wesley's "Come, Almighty to deliver," from his "Love Divine, all loves excelling," and the rest are lines rewritten from the same hymn.
--John Julian, Dictionary of Hymnology, New Supplement (1907)