 There we read, they, the Lutheran theologians, teach that the one holy church is to continue forever. The church is the congregation of saints, in which the gospel is rightly taught and the sacraments rightly administered. And to the true unity of the church, it's enough to agree concerning the doctrine of the gospel and the administration of the sacraments. Nor is it necessary that human traditions, that is, rites or ceremonies instituted by men, should everywhere be alike.