The odd use of “for Ever” is from GA, but I note it is put more normally elsewhere.
Suzanne Toolan SM does TAIZE in California and has done some work in their manner and this is one such song.
As you can see at Hymnary the ostinato refrain is just Jesus Christ followed by the title. I’m working from a melody line – pew version of GA, as I am down in Tasmania for Easter and it only has the refrain, but the accompaniment version has the dozen or so verses.
GIA have it available in a collection here.
My backing is just the refrain.