Evangelii Praecones §11

¹¹ Now this salutary progress of the work of the missions has cost not only the ceaseless and great labors of those who sowed the seed of the Gospel, but also much blood of Martyrs. During the course of the centuries there have not been lacking in some countries most violent persecutions of the nascent Church; and in our own time there are countries in the Far East which are being purpled with martyrs' blood in the same cause. We have learned that many of the faithful and also nuns, missionaries, native priests and even Bishops have been driven from their homes, despoiled of their possessions and languish in want as exiles or have been arrested, thrown into prison or into concentration camps, or sometimes cruelly done to death, because they were devoutly attached to their faith.