15 Such being the situation, We wished in conformity with Our Apostolic duty, to omit nothing, short of sacrificing the sacred rights and honor of God and of His Church, which would in any way possible assist the Church of France in securing for itself an unquestionable basis in law. This, Our action, will contribute or at least We hope it will, to the establishment of complete peace in your country, a country very dear to Our heart. Therefore, We decree and declare that Diocesan Associations may be permitted at least as an experiment, provided always they are governed by the statutes which are hereto subjoined.
Source: Maximam Gravissimamque (Vatican.va)