From that year to July 1946, he studied at the Dominican study centre Le Saulchoir at Étiolles, near Paris, where representatives of the Nouvelle théologie-movement such as Marie-Dominique Chenu and Yves Congar introduced him to modern Catholic theology as well as to the thought of Calvinist theologians like Karl Barth.
Od te je godine do 1946. studirao u Dominikanskom studijskom centru Le Saulchoir u Etiollesu, u blizini Pariza, gdje su ga predstavnici pokreta nouvelle théologie kao što su Marie-Dominique Chenu i Yves Congar upoznali s modernom katoličkom teologijom i razmišljanjima kalvinističkih teologa kao što je Karl Barth.