19 And We entrust to all of you, venerable brothers, the publication of this letter. Order every priest who celebrates the divine office according to the rites of the Roman Church to observe everything that is prescribed in this letter in each church, province, city, diocese, and monastery. We persuade and encourage you to stimulate prayer to Cyril and Methodius, so that they might intercede with God and watch over Christianity in the East. May there be constancy in all Catholic men and the will to reconcile all dissidents to the true Church.
Source: Grande Munus (Vatican.va)