Book of Concord, or Concordia, is the title of the Lutheran corpus doctrinae, i.e., of the symbols recognized and published under that name by the Lutheran Church. The word symbol, sumbolon, is derived from the verb sumballein, to compare two things for the purpose of perceiving their relation and association. Sumbolon thus developed the meaning of tessara, or sign, token, badge, banner, watchword, parole, countersign, confession, creed. A...
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