I thirst, but not as once I did. W. Cowper. [Thirsting for God.] Given in the Olney Hymns, 1779, Bk. iii., No. 61, in 5 stanzas of 4 lines, and headed, "My soul thirsteth for God." It is found in several American collections, and in a few also in Great Britain.
--John Julian, Dictionary of Hymnology (1907)