I. Definition

The phrase una sancta comes from the third article of the Niceno-Constantinopolitan Creed: “Credo . . . unam sanctam catholicam et apostolicam ecclesiam.” Serving the unity (Unity and diversity) and holiness of the church (Sacredness and sinfulness of the church) is the central purpose of the Una Sancta movement. This umbrella term includes circles of priests, theologians, religious, and lay people who labor for both the visible unity of the Christian…