Christian churches, divided and scattered over the earth, need to rediscover that there is one catholic and apostolic Church, the Communion of Saints. The author has grown up in a generation that has been struggling to find its way back to this Scriptural Doctrine of the Church. He believes the solution is to be found in the theology of Luther and the Reformation. World Lutheranism and the Ecumenical Movement need the guidance of the great Reformer. For here again we are treading the same ground that Luther and other ""saints have trod."" Herman Amberg Preus was professor of New Testament and Symbolics at Luther Theological Seminary in St. Paul, Minnesota.