74 This means that all diligence should be exercised by States to prevent within their territories the ravages of an anti-God campaign which shakes society to its very foundations. For there can be no authority on earth unless the authority of the Divine Majesty be recognized; no oath will bind which is not sworn in the Name of the Living God. We repeat what We have said with frequent insistence in the past, especially in Our Encyclical Caritate Christi: "How can any contract be maintained, and what value can any treaty have, in which every guarantee of conscience is lacking? And how can there be talk of guarantees of conscience when all faith in God and all fear of God have vanished? Take away this basis, and with it all moral law falls, and there is no remedy left to stop the gradual but inevitable destruction of peoples, families, the State, civilization itself."
Source: Divini Redemptoris (Vatican.va)