The text expresses awe at Christ's coming (st. 1) and the mystery of our perception of Christ in the body and blood (st. 2). With images from Isaiah 6 and Revelation 5, it portrays the glory of Christ (sung to by angels) and his victory over sin (st. 3-4). Although it has eucharistic emphasis, the text pictures the nativity of Christ in a majestic manner and in a much larger context than just his birth in Bethlehem. We are drawn into the awe and mystery with our own alleluias."
Bert Polman, Psalter Hymnal Handbook