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St. Thomas Aquinas: Whether it is always sinful to wage war? (1265-1272) Objection 1. It would seem that it is always sinful to wage war. Because punishment is not inflicted except for sin. Now those who wage war are threatened by Our Lord with punishment, according to Mt. 26:52: "All that take the sword shall perish with the sword." Therefore all wars are unlawful. Objection 2. Further, whatever is contrary to a Divine precept is a sin. But war is contrary to a Divine precept, for it is written (Matthew 5:39): "But I say to you not to resist evil"; and (Romans 12:19): "Not revenging yourselves, my dearly beloved, but give place unto wrath." Therefore war is always sinful. Objection 3. Further, nothing, except sin, is contrary to an act of virtue. But war is contrary to peace. Therefore war is always a sin. Objection 4. Further, the exercise of a lawful thing is itself lawful, as is evident in scientific exercises. But warlike exercises which take place in tournaments are forbidden by the Church, since those who are slain in these trials are deprived of ecclesiastical burial. Therefore it seems that war is a sin in itself. On the contrary, Augustine says in a sermon on the son of the centurion [Ep. ad Marcel. cxxxviii]: "If the Christian Religion forbade war altogether, those who sought salutary advice in the Gospel would rather have been counselled to cast aside their arms, and to give up soldiering altogether. On the contrary, they were told: 'Do violence to no man . . . and be content with your pay' [Lk. 3:14. If he commanded them to be content with their pay, he did not forbid soldiering." I answer that, In order for a war to be just, three things are necessary. First, the authority of the sovereign by whose command the war is to be waged. For it is not the business of a private individual to declare war, because he can seek for redress of his rights from the tribunal of his superior. Moreover it is not the business of a private individual to summon together the people, which has to be done in wartime. And as the care of the common weal is committed to those who are in authority, it is their business to watch over the common weal of the city, kingdom or province subject to them. And just as it is lawful for them to have recourse to the sword in defending that common weal against internal disturbances, when they punish evil-doers, according to the words of the Apostle (Romans 13:4): "He beareth not the sword in vain: for he is God's minister, an avenger to execute wrath upon him that doth evil"; so too, it is their business to have recourse to the sword of war in defending the common weal against external enemies. Hence it is said to those who are in authority (Psalm 81:4): "Rescue the poor: and deliver the needy out of the hand of the sinner"; and for this reason Augustine says (Contra Faust. xxii, 75): "The natural order conducive to peace among mortals demands that the power to declare and counsel war should be in the hands of those who hold the supreme authority."