Acts 23:24

5. As to killing others in order to defend one’s own life, I do not approve of this, unless one happen to be a soldier or public functionary acting, not for himself, but in defence of others or of the city in which he resides, if he act according to the commission lawfully given him, and in the manner becoming his office. When, however, men are prevented, by being alarmed, from doing wrong, it may be said that a real service is done to themselves. The precept, “Resist not evil,” was given to prevent us from taking pleasure in revenge, in which the mind is gratified by the sufferings of others, but not to make us neglect the duty of restraining men from sin. From this it follows that one is not guilty of homicide, because he has put up a wall round his estate, if any one is killed by the wall falling upon him when he is throwing it down. …

206. And when is that fulfilled, you will say, which the Lord declares, "The time cometh, that whosoever killeth you will think that he doeth God service"? At any rate neither can this be said of the heathen, who persecuted Christians, not for the sake of God, but for the sake of their idols. You do not see that if this had been said of these emperors who rejoice in the name of Christian, their chief command would certainly have been this, that you should have been put to death; and this command they never gave at all. But the men of your party, by opposing the laws in hostile fashion, bring deserved punishment on themselves; and their own voluntary deaths, so long as they think that they bring odium on us, they consider in no wise ruinous to themselves. …

224. Augustin answered: We put no confidence in man, but, so far as we can, we warn men to place their trust in the Lord; nor do we put confidence in princes, but, so far as we can, we warn princes to put confidence in the Lord. And though we may seek aid from princes to promote the advantage of the Church, yet do we not put confidence in them. For neither did the apostle himself put confidence in that tribune, in the sense in which the Psalmist talks of putting confidence in princes, from whom he obtained for himself that an escort of armed men should be assigned to him; nor did he put confidence in the armed men, by whose protection he escaped the snares of the wicked ones, in any such sense as that of the Psalmist where he speaks of putting confidence in men. …

28. He sought assistance, therefore, from the Christian emperor, not so much with any desire of revenging himself, as with the view of defending the Church entrusted to his charge. And if he had omitted to do this, he would have deserved not to be praised for his forbearance, but to be blamed for negligence. For neither was the Apostle Paul taking precautions on behalf of his own transitory life, but for the Church of God when he caused the plot of those who had conspired to slay him to be made known to the Roman captain, the effect of which was that he was conducted by an escort of armed soldiers to the place where they proposed to send him, that he might escape the ambush of his foes. …

Again he discourses simply as man, and he does not on all occasions alike enjoy the benefit of supernatural aid. “I am a Pharisee, the son of a Pharisee:” both in this, and in what comes after it, he wished to divide the multitude, which had an evil unanimity against him. And he does not speak a falsehood here either: for he was a Pharisee by descent from his ancestors. “Of the hope and resurrection of the dead I am called in question.” For since they would not say for what reason they arraigned him, he is compelled therefore to declare it himself. “But the Pharisees,” it says, “confess both.” And yet there are three things: how then does he say both? “Spirit and Angel” is put as one. When he is on their side, then they plead for him. …