Awake, again the Gospel trump is blown. J. Keble. [Advent.] Written on Dec. 26, 1823, and first published in his Christian Year, 1827, in 13 stanzas of 6 lines for Advent Sunday, with the text from the Epistle of that day, "Now it is high time to awake out of sleep, for now is our salvation nearer than when we believed." Its use as a hymn for public worship is very limited. In Kennedy, 1863, No. 19, stanzas i., v., xii. and xiii., are given with the change in stanza v., l. 1, of "E'en so," to "Behold the world."
-- John Julian, Dictionary of Hymnology (1907)