5 Meanwhile We did not forbear to encourage with word and counsel the lawful Christian resistance of the priests and the faithful, exhorting them to placate by penance and prayer God's Justice, that in His merciful Providence He might shorten the time of trial. At the same time We invited Our sons throughout the world to unite their prayers to Ours in behalf of their brethren in Mexico; and wonderful were the ardour and whole-heartedness with which they responded to Our appeal. Nor did We neglect to have recourse besides to the human means at Our disposal, in order to give assistance to Our beloved sons. Whilst addressing Our appeal to the Catholic world to give help, and generous alms, to their persecuted Mexican brethren, We urged the Governments with whom We have diplomatic relations to take to heart the abnormal and grievous condition of so many of the faithful.
Source: Acerba Animi (Vatican.va)