In evil long I took delight. J. Newton. [Looking at the Cross.] Published in the Olney Hymns, 1779, Bk. ii., No. 57, in 7 stanzas of 4 lines, and headed, "Looking at the Cross." Although not referred to by Josiah Bull in his account of Newton (John Newton, &c, 1868), it seems to be of special autobiographical interest as setting forth the great spiritual change which Newton underwent. In its full form it is rarely found in modern hymnbooks. Two arrangements are in common use (1) "In evil long I took delight," abridged, and (2) “I saw one hanging on a tree." The latter is mainly in American use.
--John Julian, Dictionary of Hymnology (1907)