To heal these and so bring about unity, a conference was held at Weimar in 1560, between the Lutherans Viktor Striegel (1524-1569) and Flacius, on free will.
Confessio catholica, in qua doctrina catholica et evangelica, quam ecclesiae Augustanae confessioni addictae profilentur, ex Romano-catholicorum scriptorum suffragiis confirmatur (4 parts, Frankfort and Leipsic, 1634–37), is based upon the Catalogus testium veritatis of Flacius.
The Gnesio-Lutherans exercised strict doctrinal discipline, but they also opposed with equal determination what they considered to be the errors of their fellow-combatants like von Amsdorf (Amsdorfians), Flacius (Flacians), Poach, and others.