16 Therefore We pray God that their rulers may carefully weigh and consider the causes of dissension and endeavor in good faith to remove them. They must, above all, realize that war (God keep it from us!) can have only one result, vast ruins everywhere, and thus cannot be the object of anyone's reliance. They must adapt to the needs of men of today the laws which regulate the state and society and which bind together nations and classes of society. They must be mindful of the eternal laws which come from God and are the bases and pivots of all government. Finally, they must be ever aware that the individual souls of men are created by God and destined to possess and enjoy Him.
Source: Grata Recordatio (Vatican.va)