Canisius was an influential teacher and preacher, especially through his "German Catechism", a book which defined the basic principles of Catholicism in the German language and made them more accessible to readers in German-speaking countries.
Canisius var en inflytelserik lärare och predikare särskilt genom sin "Tyska katekes", en bok som definierade katolicismens basprinciper på tyska som fick många läsare i tyskspråkiga länder.