Bright shadows of true rest. H. Vaughan. [Sundays.] From the first part of his Silex Scintillans, 1650, where it is headed "Son-Days." It is in 3 stanzas of 8 lines, and has been reprinted in the modern editions of Vaughan's work, as also in various selections of sacred poetry. In Dr. Martineau's Hymns of Prayer and Praise, 1873, it is No. 785. Original text, Aldine edition of Vaughan, London, 1883, p. 97.
-- John Julian, Dictionary of Hymnology (1907)