Pacem in Terris §134

¹³⁴ In our own day, however, mutual relationships between States have undergone a far reaching change. On the one hand, the universal common good gives rise to problems of the utmost gravity, complexity and urgency—especially as regards the preservation of the security and peace of the whole world. On the other hand, the rulers of individual nations, being all on an equal footing, largely fail in their efforts to achieve this, however much they multiply their meetings and their endeavors to discover more fitting instruments of justice. And this is no reflection on their sincerity and enterprise. It is merely that their authority is not sufficiently influential.