9 In addition to the above remarks to all the Polish people, We desire to add certain things which We think will be useful to particular places in Poland. In this way We shall fix certain of the warnings We have already given more firmly in your minds. First to those great numbers of you who live under Russian rule: it is right that We praise you and strengthen you with an exhortation to retain and steadfastly nourish the spirit of constancy in professing the Catholic faith. In it you have the source and fountain, as We have said, of the greatest blessings. To value this above all other things is certainly necessary for a Christian. Commanded by divine law and illumined by the example of holy men, he never deserts this, no matter what the obstacles. He guards it with all his strength. Relying on its strength, he confidently and patiently expects consolation and aid from God, no matter what events the human condition may bring.
Source: Caritatis (Vatican.va)