Common as in communal, not ordinary or humdrum or boring. Prayers of the community. Prayers of “the great cloud of witnesses” who have gone before us and, by God’s grace, who will come after us. Borrowed words from Scripture and from Saints long gone spoken in moments when our own words fail us.
Tonight was one of many chaplain shifts that relied heavily on these rites. The Holy Spirit works instantaneously in a thousand different ways. But the Holy Spirit also works slowly and steadily over the course of many centuries to give the church gifts like these prayers.