How vast the treasure we possess. J. Watts. [All things in Christ.] This hymn, as in Bickersteth's Christian Psalmody, enlarged edition, 1841, the Baptist Psalms & Hymns, 1858, and others, in 5 stanzas of 4 lines, is a cento from two hymns appended to Watts's Sermons, 1721-4, the first beginning, "How vast the treasure we possess"; and the second, "My soul, survey thy happiness." In the cento, stanza i. is from the first, and stanzas ii.-v. are from the second of these two hymns.
--John Julian, Dictionary of Hymnology (1907)