Congrégation du Saint-Esprit
Upon his return to Europe he was elected Superior General of the Holy Ghost Fathers and assigned to participate in the drafting and preparation of documents for the upcoming Second Vatican Council (1962–1965) announced by Pope John XXIII, and was a major leader of the conservative bloc during its proceedings. He would later take the lead in opposing certain changes within the church associated with the council. Refusing to implement council-inspired reforms demanded by its members, he resigned from the leadership of the Holy Ghost Fathers in 1968.