This document is an act of service on the part of the Church to the women and men of our time, to whom she offers the legacy of her social doctrine, according to that style of dialogue by which God himself, in his only-begotten Son made man, “addresses men as his friends (cf. Ex 33:11; Jn 15:14-15) and moves among them (cf. Bar 3:38)”14Second Vatican Ecumenical Council, Dogmatic Constitution Dei Verbum, 2: AAS 58 (1966), 818.. Drawing inspiration from the Pastoral Constitution Gaudium et Spes, this document too places “man considered whole and entire, with body and soul, heart and conscience, mind and will” 15Second Vatican Ecumenical Council, Pastoral Constitution Gaudium et Spes, 3: AAS 58 (1966), 1026. as the key to its whole exposition. In this perspective, the Church is “inspired by no earthly ambition and seeks but one solitary goal: to carry forward the work of Christ himself under the lead of the befriending Spirit. For Christ entered this world to bear witness to the truth, to save and not to sit in judgment, to serve and not to be served”16Second Vatican Ecumenical Council, Pastoral Constitution Gaudium et Spes, 3: AAS 58 (1966), 1027..
By means of the present document, the Church intends to offer a contribution of truth to the question of man's place in nature and in human society, a question faced by civilizations and cultures in which expressions of human wisdom are found. Rooted in a past that is often thousands of years old and manifesting themselves in forms of religion, philosophy and poetic genius of every time and of every people, these civilizations and cultures offer their own interpretation of the universe and of human society, and seek an understanding of existence and of the mystery that surrounds it. Who am I? Why is there pain, evil, death, despite all the progress that has been made? What is the value of so many accomplishments if the cost has been unbearable? What will there be after this life? These are the basic questions that characterize the course of human life17Cf. Second Vatican Ecumenical Council, Pastoral Constitution Gaudium et Spes, 10: AAS 58 (1966), 1032.. In this regard, we can recall the admonition “Know yourself”, carved on the temple portal at Delphi, which testifies to the basic truth that man, called to be set apart from the rest of creation, is man precisely because in his essence he is oriented to knowing himself.
The direction that human existence, society and history will take depends largely on the answers given to the questions of man's place in nature and society; the purpose of the present document is to make a contribution to these answers. The deepest meaning of human existence, in fact, is revealed in the free quest for that truth capable of giving direction and fullness to life. The aforementioned questions incessantly draw human intelligence and the human will to this quest. They are the highest expression of human nature, since they require a response that measures the depth of an individual's commitment to his own existence. Moreover, it is dealt here with questions that are essentially religious: “When the ‘why of things' is investigated integrally with the search for the ultimate and exhaustive answer, then human reason reaches its apex and opens itself to religiousness. ... religiousness represents the loftiest expression of the human person, because it is the culmination of his rational nature. It springs from man's profound aspiration for truth and is at the basis of the free and personal search he makes for the divine”18John Paul II, Address at General Audience (19 October 1983), 2: L'Osservatore Romano, English edition, 24 October 1983, p. 9..
The fundamental questions accompanying the human journey from the very beginning take on even greater significance in our own day, because of the enormity of the challenges, the novelty of the situations and the importance of the decisions facing modern generations. The first of the great challenges facing humanity today is that of the truth itself of the being who is man. The boundary and relation between nature, technology and morality are issues that decisively summon personal and collective responsibility with regard to the attitudes to adopt concerning what human beings are, what they are able to accomplish and what they should be. A second challenge is found in the understanding and management of pluralism and differences at every level: in ways of thinking, moral choices, culture, religious affiliation, philosophy of human and social development. The third challenge is globalization, the significance of which is much wider and more profound than simple economic globalization, since history has witnessed the opening of a new era that concerns humanity's destiny.
The disciples of Jesus Christ feel that they are involved with these questions; they too carry them within their hearts and wish to commit themselves, together with all men and women, to the quest for the truth and the meaning of life lived both as individual persons and as a society. They contribute to this quest by their generous witness to the free and extraordinary gift that humanity has received: God has spoken his Word to men and women throughout history; indeed he himself has entered history in order to enter into dialogue with humanity and to reveal to mankind his plan of salvation, justice and brotherhood. In Jesus Christ, his Son made man, God has freed us from sin and has shown us the path we are to walk and the goal towards which we are to strive.