It is a persistent struggle for possessions, power, and sovereignty, which primarily governs the relations of one nation to another, and right is respected so far only as it is compatible with advantage.

So long as there are men who have human feelings and aspirations, so long as there are nations who strive for an enlarged sphere of activity, so long will conflicting interests come into being and occasions for making war arise.
"The natural law, to which all laws of Nature can be reduced, is the law of struggle.

All intrasocial property, all thoughts, inventions, and institutions, as, indeed, the social system itself, are a result of the intrasocial struggle, in which one survives and another is cast out.

The extrasocial, the supersocial, struggle which guides the external development of societies, nations, and races, is war.

The internal development, the intrasocial struggle, is man's daily work--the struggle of thoughts, feelings, wishes, sciences, activities.