VI. Many noble martyrs have sprung from the blood of SS. Peter and Paul
Thither came also your blessed brother-Apostle Paul, “the vessel of election,” and the special teacher of the Gentiles, and was associated with you at a time when all innocence, all modesty, all freedom was in jeopardy under Nero's rule. Whose fury, inflamed by excess of all vices, hurled him headlong into such a fiery furnace of madness that he was the first to assail the Christian name with a general persecution, as if God's Grace could be quenched by the death of saints, whose greatest gain it was to win eternal happiness by contempt of this fleeting life.
“Precious,” therefore, “in the eyes of the Lord is the death of His saints:” nor can any degree of cruelty destroy the religion which is founded on the mystery of Christ's cross. Persecution does not diminish but increase the church, and the Lord's field is clothed with an ever richer crop, while the grains, which fall singly, spring up and are multiplied a hundred-fold. Hence how large a progeny have sprung from these two Heaven-sown seeds is shown by the thousands of blessed martyrs, who, rivalling the Apostles' triumphs, have traversed the city far and wide in purple-clad and ruddy-gleaming throngs, and crowned it, as it were with a single diadem of countless gems.
Source: Sermons (New Advent)