16 What we cannot, however, fail to mention here is the fact that We are acutely conscious of Our duty to pay particular attention to the serious problem of world peace. It is a problem which demands Our continuous personal involvement and practical concern, exercised of course within the limits of Our own ministry and entirely divorced from any set political theory and from considerations of Our own personal and purely temporal advantage. Our aim must be to educate mankind to sentiments and policies which are opposed to violent and deadly conflicts and to foster just, rational, and peaceful relations between States. We will do Our utmost to promote harmonious relations and a spirit of cooperation between nations, and We will do so by proclaiming principles which represent the highest achievement of human thought, and such as are best calculated to allay the selfishness and greed from which war takes its rise. Nor, if We are allowed the opportunity, will We fail to use our good offices in settling national disputes on a basis of fraternity and honor. We do not forget that this service, besides being one dictated by love, is in fact a plain duty. It is a duty which the awareness of Our mission in the modern world renders all the more imperative when we consider the advances that have been made in theology and in international institutions. Our mission is to bring men together in mutual love through the power of that kingdom of justice and peace which Christ inaugurated by His coming into the world.
Source: Ecclesiam Suam (Vatican.va)