4 Many are the causes to which must be ascribed the flowering of the Catholic Church in your country. One of them We wish to point out as worthy of attention. Numbers of priests, forced to flee to your shores from lands where persecution raged, brought welcome aid to Bishop Carroll and by their active collaboration in the sacred ministry sowed the precious seed which ripened to an abundant harvest of virtues. Some of them later became Bishops and thus had a more glorious share in the progress of the Catholic cause. And thus, as history teaches us again and again, the zeal of the apostle, provided that, nourished by unfeigned faith and sincere charity, it burns within the breast of valiant men, is not quenched by the storms of persecution but is carried farther across the earth.
Source: Sertum Laetitiae (Vatican.va)