I am, saith Christ, your glorious Head. J. Newton. [Easter.] First published in the Olney Hymns, 1779, Bk. i., No. 116, in 7 stanzas of 4 lines, and headed “The Resurrection and the Life." The most popular form of the hymn is that given to it by Cotterill in the 8th edition of his Selection, 1819, No. 18. This is composed of stanzas iv., ii., v.-vii. in the order named, and altered to, "Pour down Thy Spirit, gracious Lord." It is in extensive use, and sometimes as: "Pour out Thy Spirit," &c. Another form was given in Stowell's Manchester Selection, 1831, p. 87, and is still in common use. It begins, "Fulfil Thy promise, gracious Lord," and is composed of stanzas iv.-vi., and slightly altered.
--John Julian Dictionary of Hymnology (1907)