19 If they desire peace, let them lay aside their arms. If they make atonement, why do they threaten? Or if they threaten, let them know that they are not feared by God's priests. For even Antichrist, when he shall begin to come, shall not enter into the Church because he threatens; neither shall we yield to his arms and violence, because he declares that he will destroy us if we resist. Heretics arm us when they think that we are terrified by their threatenings; nor do they cast us down on our face, but rather they lift us up and inflame us, when they make peace itself worse to the brethren than persecution.
And we desire, indeed, that they may not fill up with crime what they speak in madness, that they who sin with perfidious and cruel words may not also sin in deeds. We pray and beseech God, whom they do not cease to provoke and exasperate, that He will soften their hearts, that they may lay aside their madness, and return to soundness of mind; that their breasts, covered over with the darkness of sins, may acknowledge the light of repentance, and that they may rather seek that the prayers and supplications of the priest may be poured out on their behalf, than themselves pour out the blood of the priest.
But if they continue in their madness, and cruelly persevere in these their parricidal deceits and threats, no priest of God is so weak, so prostrate, and so abject, so inefficient by the weakness of human infirmity, as not to be aroused against the enemies and impugners of God by strength from above; as not to find his humility and weakness animated by the vigour and strength of the Lord who protects him. It matters nothing to us by whom, or when we are slain, since we shall receive from the Lord the reward of our death and of our blood. Their concision is to be mourned and lamented, whom the devil so blinds, that, without considering the eternal punishments of Gehenna, they endeavour to imitate the coming of Antichrist, who is now approaching.
Source: The Epistles of Cyprian (New Advent)