After all this scientific and technical progress, and even because of it, the problem remains: how to build up a new order of society based on a more balanced human relationship between political communities on a national and international level?
The attempt to find a solution to this problem has given birth to a number of theories. Some of these were little more than ephemeral; others have undergone, and are still undergoing, substantial change; others again are proving themselves less and less attractive to modern man. Why is this? It is because these ideologies do not take account of the whole man, nor even of his most important part. In particular, they take little account of certain inevitable human weaknesses such as sickness and suffering, weaknesses which even the most advanced economic and social systems cannot completely eliminate. Finally, they fail to take account of that deep-rooted sense of religion which exists in all men everywhere, and which nothing, neither violence nor cunning, can eradicate.
The most fundamental modern error is that of imagining that man's natural sense of religion is nothing more than the outcome of feeling or fantasy, to be eradicated from his soul as an anachronism and an obstacle to human progress. And yet this very need for religion reveals a man for what he is: a being created by God and tending always toward God. As we read in St. Augustine: "Lord, you have made us for yourself, and our hearts can find no rest until they rest in you". 46Confessions I, 1. The Real Source of Justice, Truth and Love
Let men make all the technical and economic progress they can, there will be no peace nor justice in the world until they return to a sense of their dignity as creatures and sons of God, who is the first and final cause of all created being. Separated from God a man is but a monster, in himself and toward others; for the right ordering of human society presupposes the right ordering of man's conscience with God, who is Himself the source of all justice, truth and love.