The text, Christus Paradox, is by Sylvia Dunstan and is set to PICARDY. This is an unusually intelligent set of lyrics and by cunningly setting it to a familiar tune, she gets us to sing out her paradox so that we can live the incomprehensible.
GIA have a choral arrangement but the text is at Hymnary and it can be sung to any plain arrangement of PICARDY.