12 Finally, there is another point on which We cannot be silent. Besides the injury it inflicts on the interests of the Church, the new law is destined to be most disastrous to your country. For there can be no doubt but that it lamentably destroys union and concord. And yet without such union and concord no nation can live long or prosper. Especially in the present state of Europe, the maintenance of perfect harmony must be the most ardent wish of everybody in France who loves his country and has its salvation at heart. As for Us, following the example of Our Predecessor and inheriting from him a special predilection for your nation, We have not confined Ourself to striving for the preservation of full rights of the religion of your forefathers, but We have always, with that fraternal peace of which religion is certainly the strongest bond ever before Our eyes, endeavored to promote unity among you. We cannot, therefore, without the keenest sorrow observe that the French Government has just done a deed which inflames on religious grounds passions already too dangerously excited, and which, therefore, seems to be calculated to plunge the whole country into disorder.
Source: Vehementer Nos (Vatican.va)