14 The missionaries who toil in distant lands are championing a cause not unlike that of the early Church. For those who along with the Princes of the Apostles, Peter and Paul, brought the Gospel to the citadel of the Roman Empire found themselves in a rather similar situation in Rome. If one remembers that the infant Church at that time was devoid of all natural means and was exposed to hardships, trials and persecutions, he must be deeply struck with admiration at the sight of a handful of unarmed Christians overthrowing what was perhaps the greatest power that ever existed. What happened then, will undoubtedly often happen again. just as the youth David, who put his trust more in God's help than in his own sling, laid low the armorclad giant Goliath, so the Divine society, which Christ founded, can never be overcome by an earthly power, but is destined to come forth the serene conqueror of all persecutions. Though We know well that this is due to the indefectible Divine promises, still We cannot but express Our gratitude to all those who have borne witness to their unshaken and invincible faith in Jesus Christ and in His Church, the pillar and ground of truth, exhorting them at the same time to continue in their constancy.
Source: Evangelii Praecones (Vatican.va)