7 Cognizant of these grave dangers threatening mankind, and conscious of Our duty as Supreme Pastor, We deem it necessary to voice Our anxious concern and Our fears that these tensions may degenerate into a bloody war. We implore all those who bear the responsibility of public authority not to disregard mankind's unanimous desires to achieve peace. Let them try everything in their power to preserve the peace which is now threatened. Let them not cease to promote discussions and negotiations on every possible occasion and between men of every rank, so that they may forestall the dangerous recourse to weapons and the terrible misfortunes which result for temporal, spiritual, and moral values. Following the paths marked out by law, let them try to single out every sincere quest for justice and peace; let them encourage such quests and make them successful; let them place confidence in every sincere token of good will, so that the praiseworthy cause of right order may prevail over the cause of disorder and ruin.
Source: Mense Maio (Vatican.va)