Pope John Paul II
Sollicitudo Rei Socialis §7
Sollicitudo Rei Socialis: On Social Concern
7 There is also the theme of the Encyclical which, in keeping with the great tradition of the Church's social teaching, takes up again in a direct manner the new exposition and rich synthesis which the Council produced, notably in the Constitution Gaudium et Spes . With regard to the content and themes once again set forth by the Encyclical, the following should be emphasized: the awareness of the duty of the Church, as "an expert in humanity," "to scrutinize the signs of the times and to interpret them in the light of the Gospel" ; the awareness, equally profound, of her mission of "service," a mission distinct from the function of the State, even when she is concerned with people's concrete situation" ; the reference to the notorious inequalities in the situations of those same people ; the confirmation of the Council's teaching, a faithful echo of the centuries - old tradition of the Church regarding the "universal purpose of goods" ; the appreciation of the culture and the technological civilization which contribute to human liberation, without failing to recognize their limits's ; finally, on the specific theme of development, which is precisely the theme of the Encyclical, the insistence on the "most serious duty" incumbent on the more developed nations "to help the developing countries." The same idea of development proposed by the Encyclical flows directly from the approach which the Pastoral Constitution takes to this problem. These and other explicit references to the Pastoral Constitution lead one to conclude that the Encyclical presents itself as an application of the Council's teaching in social matters to the specific problem of the development and the underdevelopment of peoples.
Source: Sollicitudo Rei Socialis (Vatican.va)