on Military Service

Augustine Reply to Faustus the Manichean Book 22 pa 74 (354-430 ad)
The real evils in war are love of violence, revengeful cruelty, fierce and implacable enmity, wild resistance, and the lust of power, and such like; and it is generally to punish these things, when force is required to inflict the punishment, that, in obedience to God or some lawful authority, good men undertake wars, when they find themselves in such a position as regards the conduct of human affairs, that right conduct requires them to act, or to make others act in this way. Otherwise John, when the soldiers who came to be baptized asked, What shall we do? would have replied, Throw away your arms; give up the service; never strike, or wound, or disable any one. But knowing that such actions in battle were not murderous but authorized by law, and that the soldiers did not thus avenge themselves, but defend the public safety, he replied, "Do violence to no man, accuse no man falsely, and be content with your wages."