1. The social concern of the Church, directed towards an authentic development of man and society which would respect and promote all the dimensions of the human person, has always expressed itself in the most varied ways. In recent years, one of the special means of intervention has been the Magisterium of the Roman Pontiffs which, beginning with the Encyclical Rerum Novarum of Leo XIII as a point of reference,1 has frequently dealt with the question and has sometimes made the dates of publication of the various social documents coincide with the anniversaries of that first document.²

The Popes have not failed to throw fresh light by means of those messages upon new aspects of the social doctrine of the Church. As a result, this doctrine, beginning with the outstanding contribution of Leo XIII and enriched by the successive contributions of the Magisterium, has now become an updated doctrinal "corpus." It builds up gradually, as the Church, in the fullness of the word revealed by Christ Jesus³ and with the assistance of the Holy Spirit (cf. Jn 14:16, 26; 16:13-15), reads events as they unfold in the course of history. She thus seeks to lead people to respond, with the support also of rational reflection and of the human sciences, to their vocation as responsible builders of earthly society.

2. Part of this large body of social teaching is the distinguished Encyclical Populorum Progressio,4 which my esteemed predecessor Paul VI published on March 26, 1967.

The enduring relevance of this Encyclical is easily recognized if we note the series of commemorations which took place during 1987 in various forms and in many parts of the ecclesiastical and civil world. For this same purpose, the Pontifical Commission Iustitia et Pax sent a circular letter to the Synods of the Oriental Catholic Churches and to the Episcopal Conferences, asking for ideas and suggestions on the best way to celebrate the Encyclical's anniversary, to enrich its teachings and, if need be, to update them. At the time of the twentieth anniversary, the same Commission organized a solemn commemoration in which I myself took part and gave the concluding address.⁵ And now, also taking into account the replies to the above-mentioned circular letter, I consider it appropriate, at the close of the year 1987, to devote an Encyclical to the theme of Populorum Progressio.

3. In this way I wish principally to achieve two objectives of no little importance: on the one hand, to pay homage to this historic document of Paul VI and to its teaching; on the other hand, following in the footsteps of my esteemed predecessors in the See of Peter, to reaffirm the continuity of the social doctrine as well as its constant renewal. In effect, continuity and renewal are a proof of the perennial value of the teaching of the Church.

This twofold dimension is typical of her teaching in the social sphere. On the one hand it is constant, for it remains identical in its fundamental inspiration, in its "principles of reflection," in its "criteria of judgment," in its basic "directives for action,"6 and above all in its vital link with the Gospel of the Lord. On the other hand, it is ever new, because it is subject to the necessary and opportune adaptations suggested by the changes in historical conditions and by the unceasing flow of the events which are the setting of the life of people and society.

4. I am convinced that the teachings of the Encyclical Populorum Progressio, addressed to the people and the society of the '60s, retain all their force as an appeal to conscience today in the last part of the '80s, in an effort to trace the major lines of the present world always within the context of the aim and inspiration of the "development of peoples," which are still very far from being exhausted. I therefore propose to extend the impact of that message by bringing it to bear, with its possible applications, upon the present historical moment, which is no less dramatic than that of twenty years ago.

The present period of time, on the eve of the third Christian millennium, is characterized by a widespread expectancy, rather like a new "Advent,"7 which to some extent touches everyone. It offers an opportunity to study the teachings of the Encyclical in greater detail and to see their possible future developments.

The aim of the present reflection is to emphasize, through a theological investigation of the present world, the need for a fuller and more nuanced concept of development, according to the suggestions contained in the Encyclical. Its aim is also to indicate some ways of putting it into effect.