CSDC 77

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.