The notion of the contentious and sanguinary struggle for existence finds its most pronounced popular expression in the existence of human war. It is a wide-spread opinion that war is necessary in the nature of things, and, in fact, it has been not only justified but glorified on this basis. We may here examine this contention briefly, and we may ask whether, in the case of human beings, there are other sufficient means of personal and social development than by mortal combat with one's fellows. We may ask whether the principle of enmity or the principle of fellow feeling is the more important and controlling. We are not to deny or even to overlook the great results that have come from war. Virile races have forced themselves to the front and have impressed their stamp on society; the peoples have been mixed and also assorted; lethargic folk have been galvanized into activity; iron has been put into men's sinews; heroic deeds have arisen; old combinations and intrigues have been broken up (although new ones take their place). A kind of national purification may result from a great war. The state of human affairs has been brought to its present condition largely as the issue of wars. On the other hand, we are not to overlook the damaging results, the destruction, the anguish, the check to all productive enterprise, the hatred and revenge, the hypocrisy and deceit, the despicable foreign spy system, the loss of standards, the demoralization, the lessening respect and regard for the rights of the other, the breeding of human parasites that fatten at the fringes of disaster, the levying of tribute, the setting up of unnatural boundaries, the thwarting of national and racial developments which, so far as we can see, gave every promise of great results. We naturally extol the nations that have survived; we do not know how many superior stocks may have been sacrificed to military conquest, or how many racial possibilities may have been suppressed in their beginnings. Vast changes in mental attitudes may result from a great war, and the course of civilization may be deflected; and while we adjust ourselves to these changes, no one may say at the time that they are just or even that they are temporarily best. We are never able at the moment to measure the effects of the unholy conquest of peoples who should not have been conquered; these results work themselves out in tribulation and perhaps in loss of effort and of racial standards through many weary centuries. Force, or even "success," cannot justify theft.