4 If we weigh carefully the causes of today's crises and those that are ahead, we shall soon find that human plans, human resources, and human endeavors are futile and will fail when Almighty God - He who enlightens, commands, and forbids; He who is the source and guarantor of justice, the fountainhead of truth, the basis of all laws - is esteemed but little, denied His proper place, or even completely disregarded. If a house is not built on a solid and sure foundation, it tumbles down; if a mind is not enlightened by the divine light, it strays more or less from the whole truth; if citizens, peoples, and nations are not animated by brotherly love, strife is born, waxes strong, and reaches full growth.
Source: Meminisse Iuvat (Vatican.va)