Taking Matthew 1: 1-11 as his theme for stanzas 1-3, Dix likens the journey of the wise men who came to worship the Christ to our own Christian pilgrimage. The pattern of these stanzas is "as they … so may we." Stanzas 4 and 5 are a prayer that our journey on the "narrow way" may bring us finally to glory where Christ is the light (Rev. 21:23) and where we may perfectly sing his praise.
Psalter Hymnal Handbook
Throughout stanza 2, Jesus is manifested as “prophet, priest and king supreme”; using parallel language, Heidelberg Catechism, Lord’s Day 12, Question and Answer 31 explains that Jesus is “anointed with the Holy Spirit” to be our “chief prophet and teacher,” our “only high priest” and our “eternal king.”
The refrain ends by confessing that “God in flesh [is] made manifest.” Heidelberg Catechism, Lord’s Day 14, Question and Answer 35 also confesses that Jesus “took to himself, through the working of the Holy Spirit, from the flesh and blood of the virgin Mary, a truly human nature...”