Beyond all question, the mystery from which true godliness springs is great:
He appeared in the flesh,
was vindicated by the Spirit,
was seen by angels,
was preached among the nations,
was believed on in the world,
was taken up in glory.
What is the difference for the Christian? What enables us toward true godliness? The simple answer is Christ, and Christ in his coming. What we celebrate at Christmas. And what we see in Christ in his incarnation, life and ministry of teaching and healing, his death and resurrection, his ascension and the Spirit being poured out, and the promise of his return when what he has accomplished will be completed.
The hymn like any good hymn gives us a particular focus. And the focus is on Christ himself, and the events and impact of that on the world. That makes all the difference. In and through Jesus.