Continuing with Martin Luther's "Credo of Belief":

"I believe that there is on earth (as wide as the world is) no more than one, holy, univeral, Christian Church, which is nothing other than the community or assembly of saints - devout, believing persons on earth - which is gathered, kept and ruled by the same Holy Spirit and grows daily in the sacraments and God's Word.

I believe that no one can be saved who is not found in this community, harmoniously holding with it one faith, Word, sacraments, hope and love...no sinner will be saved with it unless reconciled to it, united and become one in all things."