From Pope St. John Paul II’s encyclical Veritatis Splendor (1993):
At all times, but particularly in the last two centuries, the Popes, whether individually or together with the College of Bishops, have developed and proposed a moral teaching regarding the many different spheres of human life. In Christ’s name and with his authority they have exhorted, passed judgment and explained. In their efforts on behalf of humanity, in fidelity to their mission, they have confirmed, supported and consoled. With the guarantee of assistance from the Spirit of truth they have contributed to a better understanding of moral demands in the areas of human sexuality, the family, and social, economic and political life. In the tradition of the Church and in the history of humanity, their teaching represents a constant deepening of knowledge with regard to morality.8
Today, however, it seems necessary to reflect on the whole of the Church’s moral teaching, with the precise goal of recalling certain fundamental truths of Catholic doctrine which, in the present circumstances, risk being distorted or denied. In fact, a new situation has come about within the Christian community itself, which has experienced the spread of numerous doubts and objections of a human and psychological, social and cultural, religious and even properly theological nature, with regard to the Church’s moral teachings. It is no longer a matter of limited and occasional dissent, but of an overall and systematic calling into question of traditional moral doctrine, on the basis of certain anthropological and ethical presuppositions. At the root of these presuppositions is the more or less obvious influence of currents of thought which end by detaching human freedom from its essential and constitutive relationship to truth. Thus the traditional doctrine regarding the natural law, and the universality and the permanent validity of its precepts, is rejected; certain of the Church’s moral teachings are found simply unacceptable; and the Magisterium itself is considered capable of intervening in matters of morality only in order to “exhort consciences” and to “propose values”, in the light of which each individual will independently make his or her decisions and life choices.
In particular, note should be taken of the lack of harmony between the traditional response of the Church and certain theological positions, encountered even in Seminaries and in Faculties of Theology, with regard to questions of the greatest importance for the Church and for the life of faith of Christians, as well as for the life of society itself. In particular, the question is asked: do the commandments of God, which are written on the human heart and are part of the Covenant, really have the capacity to clarify the daily decisions of individuals and entire societies? Is it possible to obey God and thus love God and neighbour, without respecting these commandments in all circumstances? Also, an opinion is frequently heard which questions the intrinsic and unbreakable bond between faith and morality, as if membership in the Church and her internal unity were to be decided on the basis of faith alone, while in the sphere of morality a pluralism of opinions and of kinds of behaviour could be tolerated, these being left to the judgment of the individual subjective conscience or to the diversity of social and cultural contexts.
8 Pius XII had already pointed out this doctrinal development: cf. Radio Message for the Fiftieth Anniversary of the Encyclical Letter Rerum Novarum of Leo XIII (June 1, 1941): Acta Apostolicae Sedis 33 (1941), 195-205. Also John XXIII, Encyclical Letter Mater et Magistra (May 15, 1961): AAS 53 (1961), 410-413.
— Veritatis Splendor 4