a pure Christian symbol

To this Christian [pious] Augsburg Confession, so thoroughly grounded in God's Word, we herewith pledge ourselves again [publicly and solemnly] from our inmost hearts; we abide by its simple, clear, and unadulterated meaning as the words convey it, and regard the said Confession as a pure Christian symbol, with which at the present time true Christians ought to be found next to [which pious hearts ought to receive next to the matchless authority of] God's Word; just as in former times concerning certain great controversies that had arisen in the Church of God, symbols and confessions were proposed, to which the pure teachers and hearers at that time pledged themselves with heart and mouth. -- preface to Solid Declaration, Formula of Concord