Johann Joseph Ignaz von Döllinger said of the work on Luther: "Audin's work is written with an extraordinary and at times almost naive ignorance of Luther's writings and contemporary literature, and of the general condition of Germany at that period" (Kirchenlexikon, s.v.
Johann Joseph Ignaz von Döllinger expressed disapproval of Audin's work on Luther, highlighting its shortcomings in understanding Luther's writings and the broader context of German society during that period. (Kirchenlexikon, s.v.)