5 But as this hope fails Us while the law remains what it is, We declare that it is not permissible to try this other kind of association as long as it is not established in a sure and legal manner that the Divine constitution of the Church, the immutable rights of the Roman Pontiff and of the Bishops, as well as their authority over the necessary property of the Church and particularly over the sacred edifices, shall be irrevocably placed in the said associations in full security. To desire the contrary is impossible for us, without betraying the sanctity of Our office and bringing about the ruin of the Church of France.
Source: Gravissimo Officii Munere (Vatican.va)