The book was very inconvenient to the Protestants, as it served to emphasize the Eucharistic differences between the Lutherans and Zwinglians at a moment when efforts were being made to reconcile them.
This excluded, of course, not only the Zwinglians and Anabaptists, but the ever-increasing Calvinistic or " Reformed " Church.
In Germany the Reformers called themselves usually evangelici, and avoided special designations for their communities, which they conceived only as part of the true Catholic Church; "Calvinists," "Lutherans," "Zwinglians" were, in the main, terms of abuse intended to stamp them as followers of one or other heretical leader, like Arians or Hussites.
Zwinglians to act together even when threatened by a common danger, while a little later the alliance between the Lutheran states of north Germany and the -Zwinglian cities of the south was destroyed by differences upon points of doctrine.
Drawn up by Melanchthon, this pronouncement was intended to widen the breach between the Lutherans and the Zwinglians, and to narrow that between the Lutherans and the Romanists; from this time it was regarded as the chief standard of the Lutheran faith.
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