5 In the midst of such great destruction and perturbation of affairs, while many are still angry and inimical to one another, it is certainly not easy to achieve such a peace. Peace must be tempered by the impartial scale of justice, which embraces in fraternal charity all peoples and all nations and which does not bear hidden germs of discord and strife. Therefore, those who must come to agreement in this most grave cause, and those on whose recommendations not only the fate of their nations depends, but also the relationships of all mankind and the future course of the ages, especially need celestial help. We therefore desire that the faithful pray humbly to God. We also desire that during the month of May, innocent children especially beg from the Mother of divine Wisdom expressly this heavenly light for those who will adjudicate the universal cause. Let them consider seriously and ponder before God whatever has transgressed the limits of justice and equity. If these matters are not resolved, it would be detrimental both for the victors and the vanquished, since then their solutions could themselves bear the seeds of future wars.
Source: Communium Interpretes Dolorum (Vatican.va)