https://www.vatican.va/content/john-xxiii/en/encyclicals/documents/hf_j-xxiii_enc_11041963_pacem.html ENCYCLICAL OF POPE JOHN XXIII  ON ESTABLISHING UNIVERSAL PEACE IN TRUTH, JUSTICE, CHARITY, AND LIBERTY APRIL 11, 1963 Peace on Earth—which man throughout the ages has so longed for and sought after—can never be established, never guaranteed, except by the diligent observance of the divinely established order. Order in the Universe 2. That a marvelous order predominates in the world of living beings and in the forces of nature, is the plain lesson which the progress of modern research and the discoveries of technology teach us. And it is part of the greatness of man that he can appreciate that order, and devise the means for harnessing those forces for his own benefit.