9 Wherefore the Church does in every place, because of that love which she cherishes towards God, send forward, throughout all time, a multitude of martyrs to the Father; while all others not only have nothing of this kind to point to among themselves, but even maintain that such witness-bearing is not at all necessary, for that their system of doctrines is the true witness [for Christ], with the exception, perhaps, that one or two among them, during the whole time which has elapsed since the Lord appeared on earth, have occasionally, along with our martyrs, borne the reproach of the name (as if he too [the heretic] had obtained mercy), and have been led forth with them [to death], being, as it were, a sort of retinue granted unto them.
For the Church alone sustains with purity the reproach of those who suffer persecution for righteousness' sake, and endure all sorts of punishments, and are put to death because of the love which they bear to God, and their confession of His Son; often weakened indeed, yet immediately increasing her members, and becoming whole again, after the same manner as her type, Lot's wife, who became a pillar of salt. Thus, too, [she passes through an experience] similar to that of the ancient prophets, as the Lord declares, “For so persecuted they the prophets who were before you;” inasmuch as she does indeed, in a new fashion, suffer persecution from those who do not receive the word of God, while the self-same spirit rests upon her [as upon these ancient prophets].
Source: Adversus haereses (New Advent)