Among the things which become “old” as a result of being incorporated into Tradition, and which offer opportunities and material for enriching both Tradition and the life of faith, there is the fruitful activity of many millions of people, who, spurred on by the social Magisterium, have sought to make that teaching the inspiration for their involvement in the world. Acting either as individuals or joined together in various groups, associations and organizations, these people represent a great movement for the defence of the human person and the safeguarding of human dignity. Amid changing historical circumstances, this movement has contributed to the building up of a more just society or at least to the curbing of injustice. . . .
If we then inquire as to the source of this mistaken concept of the nature of the person and the “subjectivity” of society, we must reply that its first cause is atheism. It is by responding to the call of God contained in the being of things that man becomes aware of his transcendent dignity. Every individual must give this response, which constitutes the apex of his humanity, and no social mechanism or collective subject can substitute for it. The denial of God deprives the person of his foundation, and consequently leads to a reorganization of the social order without reference to the person’s dignity and responsibility.
The atheism of which we are speaking is also closely connected with the rationalism of the Enlightenment, which views human and social reality in a mechanistic way. Thus there is a denial of the supreme insight concerning man’s true greatness, his transcendence in respect to earthly realities, the contradiction in his heart between the desire for the fullness of what is good and his own inability to attain it and, above all, the need for salvation which results from this situation. . . .
But the true cause of the new developments was the spiritual void brought about by atheism, which deprived the younger generations of a sense of direction and in many cases led them, in the irrepressible search for personal identity and for the meaning of life, to rediscover the religious roots of their national cultures, and to rediscover the person of Christ himself as the existentially adequate response to the desire in every human heart for goodness, truth and life. This search was supported by the witness of those who, in difficult circumstances and under persecution, remained faithful to God. Marxism had promised to uproot the need for God from the human heart, but the results have shown that it is not possible to succeed in this without throwing the heart into turmoil.