Athanasius of Alexandria

For the truth is not preached with swords or with darts, nor by means of soldiers, but by persuasion and counsel. But what persuasion is there where fear of the emperor prevails? Or what counsel is there, when he who withstands them receives at last banishment and death? Even David, although he was a king and had his enemy in his power, did not prevent the soldiers by an exercise of authority when they wished to kill his enemy, but, as the Scripture says, David persuaded his men by arguments, and did not allow them to rise up and put Saul to death. But [the devil], being without arguments of reason, forces all men by his power, that it may be shown to all that their wisdom is not according to God but merely human, and that they who favor the Arian doctrines have indeed no king but Caesar; for by his means it is that these enemies of Christ accomplish whatsoever they wish to do.