3 By now, of course, that war is over, but a just peace does not yet prevail, nor do men live in concord founded on brotherly understanding. For the seeds of war either lurk in hiding or - from time to time - erupt threateningly and hold the hearts of men in frightened suspense, especially since human ingenuity has devised weapons so powerful that they can ravage and sink into general destruction, not only the vanquished, but the victors with them, and all mankind.
Source: Meminisse Iuvat (Vatican.va)