Compendium of the Social Doctrine of the Church

The Church's social doctrine avails itself of contributions from all branches of knowledge, whatever their source, and has an important interdisciplinary dimension. “In order better to incarnate the one truth about man in different and constantly changing social, economic and political contexts, this teaching enters into dialogue with the various disciplines concerned with man. It assimilates what these disciplines have to contribute”^{108John Paul II, Encyclical Letter Centesimus Annus, 59: AAS 83 (1991), 864.}. The social doctrine makes use of the significant contributions of philosophy as well as the descriptive contributions of the human sciences.

Above all, the contribution of philosophy is essential. This contribution has already been seen in the appeal to human nature as a source and to reason as the cognitive path of faith itself. By means of reason, the Church's social doctrine espouses philosophy in its own internal logic, in other words, in the argumentation that is proper to it. Affirming that the Church's social doctrine is part of theology rather than philosophy does not imply a disowning or underestimation of the role or contribution of philosophy. In fact, philosophy is a suitable and indispensable instrument for arriving at a correct understanding of the basic concepts of the Church's social doctrine, concepts such as the person, society, freedom, conscience, ethics, law, justice, the common good, solidarity, subsidiarity, the State. This understanding is such that it inspires harmonious living in society. It is philosophy once more that shows the reasonableness and acceptability of shining the light of the Gospel on society, and that inspires in every mind and conscience openness and assent to the truth.

A significant contribution to the Church's social doctrine comes also from human sciences and the social sciences^{109In this regard, the foundation of the Pontifical Academy of Social Sciences is significant; in the motu proprio establishing the Academy one reads: “Social science research can effectively contribute to improving human relations, as has been shown by the progress achieved in various sectors of society especially during the century now drawing to a close. This is why the Church, ever concerned for man's true good, has turned with growing interest to this field of scientific research in order to obtain concrete information for fulfilling the duties of her Magisterium”: John Paul II, Motu Proprio Socialium Scientiarum (1 January 1994): AAS 86 (1994), 209.}. In view of that particular part of the truth that it may reveal, no branch of knowledge is excluded. The Church recognizes and receives everything that contributes to the understanding of man in the ever broader, more fluid and more complex net work of his social relationships. She is aware of the fact that a profound understanding of man does not come from theology alone, without the contributions of many branches of knowledge to which theology itself refers. This attentive and constant openness to other branches of knowledge makes the Church's social doctrine reliable, concrete and relevant. Thanks to the sciences, the Church can gain a more precise understanding of man in society, speak to the men and women of her own day in a more convincing manner and more effectively fulfil her task of incarnating in the conscience and social responsibility of our time, the word of God and the faith from which social doctrine flows^{110Cf. John Paul II, Encyclical Letter Centesimus Annus, 54: AAS 83 (1991), 860.}. This interdisciplinary dialogue also challenges the sciences to grasp the perspectives of meaning, value and commitment that the Church's social doctrine reveals and to “open themselves to a broader horizon, aimed at serving the individual person who is acknowledged and loved in the fullness of his or her vocation”^{111John Paul II, Encyclical Letter Centesimus Annus, 59: AAS 83 (1991), 864.}.