18 There now remains nothing further for Us to write about except to proffer, from the depths of Our fatherly affection, to you, to your clergy, and to your flocks, the following very important piece of advice. In the first place, We wish you to recall a certain fact to your priests and to the faithful confided to your care, a fact which you know already and which you yourselves will explain to them somewhat more in detail. The fact is this. If the new Associations and the statutes which are to govern them contribute to making the juridical position of the Church in your country somewhat more stable and by consequence more satisfactory than it has been, this should not be accepted as a reason for permitting that noble and generous rivalry between them, and which We have already praised in this very letter, to go out of existence. Otherwise the property which was lost to the Church by reason of the law of separation could never be recovered; which if it should be recovered or paid for, that would be only an act of restitution dictated by justice.
Source: Maximam Gravissimamque (Vatican.va)