From Pope St. John Paul II’s encyclical Fides et Ratio (1984):
These considerations apply equally to moral theology. It is no less urgent that philosophy be recovered at the point where the understanding of faith is linked to the moral life of believers. Faced with contemporary challenges in the social, economic, political and scientific fields, the ethical conscience of people is disoriented. In the Encyclical Letter Veritatis Splendor, I wrote that many of the problems of the contemporary world stem from a crisis of truth. I noted that “once the idea of a universal truth about the good, knowable by human reason, is lost, inevitably the notion of conscience also changes. Conscience is no longer considered in its prime reality as an act of a person’s intelligence, the function of which is to apply the universal knowledge of the good in a specific situation and thus to express a judgment about the right conduct to be chosen here and now. Instead, there is a tendency to grant to the individual conscience the prerogative of independently determining the criteria of good and evil and then acting accordingly. Such an outlook is quite congenial to an individualist ethic, wherein each individual is faced with his own truth different from the truth of others”.116
Throughout the Encyclical I underscored clearly the fundamental role of truth in the moral field. In the case of the more pressing ethical problems, this truth demands of moral theology a careful enquiry rooted unambiguously in the word of God. In order to fulfil its mission, moral theology must turn to a philosophical ethics which looks to the truth of the good, to an ethics which is neither subjectivist nor utilitarian. Such an ethics implies and presupposes a philosophical anthropology and a metaphysics of the good. Drawing on this organic vision, linked necessarily to Christian holiness and to the practice of the human and supernatural virtues, moral theology will be able to tackle the various problems in its competence, such as peace, social justice, the family, the defence of life and the natural environment, in a more appropriate and effective way.
116 No. 32: Acta Apostolicæ Sedis 85 (1993), 1159-1160.
— Fides et Ratio 98