28 These words of the Holy Bible have been fulfilled and are now at this very moment being fulfilled before our very eyes. Because men have forsaken God and Jesus Christ, they have sunk to the depths of evil. They waste their energies and consume their time and efforts in vain sterile attempts to find a remedy for these ills, but without even being successful in saving what little remains from the existing ruin. It was a quite general desire that both our laws and our governments should exist without recognizing God or Jesus Christ, on the theory that all authority comes from men, not from God. Because of such an assumption, these theorists fell very short of being able to bestow upon law not only those sanctions which it must possess but also that secure basis for the supreme criterion of justice which even a pagan philosopher like Cicero saw clearly could not be derived except from the divine law. Authority itself lost its hold upon mankind, for it had lost that sound and unquestionable justification for its right to command on the one hand and to be obeyed on the other. Society, quite logically and inevitably, was shaken to its very depths and even threatened with destruction, since there was left to it no longer a stable foundation, everything having been reduced to a series of conflicts, to the domination of the majority, or to the supremacy of special interests.
Source: Ubi Arcano Dei Consilio (Vatican.va)