Martin Luther on War
Let this be, then, the first thing to be said in this matter: No war is just, even if it is a war between equals, unless one has such a good reason for fighting and such a good conscience that he can say, “My neighbor compels and forces me to fight, though I would rather avoid it.” In that case, it can be called not only war, but lawful self-defense, for we must distinguish between wars that someone begins because that is what he wants to do and does before anyone else attacks him, and those wars that are provoked when an attack is made by someone else. The first kind can be called wars of desire; the second, wars of necessity. The first kind are of the devil; God does not give good fortune to the man who wages that kind of war. The second kind are human disasters; God help in them!