Awake, sweet harp of Judah, wake. H. K. White. [Heaven.] In Southey's edition of H. K White's Remains, 1807, this hymn is given in 7 stanzas of 4 lines, with the title "In heaven we shall be purified, so as to be able to endure the splendours of the Deity," and accompanied with the following note:—
The last stanza of this hymn was added extemporaneously by Henry one summer evening, when he was with a few friends on the Trent, and singing it as he was used to do on such occasions."
In the few modern collections in which this hymn is found it is given in an abbreviated form. The original text is in Lyra Britannica, 1867, p. 628. [William T. Brooke]
-- John Julian, Dictionary of Hymnology (1907)