14 All that We have said here to individuals about the duty of charity We wish to say also to the peoples who have been delivered from the burden of a long war, in order that, when every cause of disagreement has been, as far as possible, removed, and without prejudice to the rights of justice, they may resume friendly relations among themselves. The Gospel has not one law of charity for individuals, and another for States and nations, which are indeed but collections of individuals. The war being now over, people seem called to a general reconciliation not only from motives of charity, but from necessity; the nations are naturally drawn together by the need they have of one another, and by the bond of mutual good will, bonds which are today strengthened by the development of civilization and the marvellous increase of communication.
Source: Pacem, Dei Munus Pulcherrimum (Vatican.va)