It’s the simple, one sentence rote prayer that we use as a reset button to switch gears, thoughts and images as we pray the Rosary. We use it after each decade, to switch to the next Mystery in the chain. Control/Alt/delete/click the next icon. Let’s call it the Rosary deep meditation cleansing breath between Mysteries, acknowledging the Holy Trinity’s awe. The Baptists and evangelicals all holler, “AMEN!” and “PRAISE GOD!” and “HALLELUIAH!” when they hear the preacher say something good, during a sermon. I think this is just a longer, better, more Catholic version.
Glory be to the Father and to the Son and to the Holy Spirit, now and ever shall be, world without end, Amen.