71 The idea which credits the State with unlimited authority is not simply an error harmful to the internal life of nations, to their prosperity, and to the larger and well-ordered increase in their well-being, but likewise it injures the relations between peoples, for it breaks the unity of supra-national society, robs the law of nations of its foundation and vigor, leads to violation of others' rights and impedes agreement and peaceful intercourse.
Source: Summi Pontificatus (Vatican.va)