From Pope St. John Paul II’s encyclical Veritatis Splendor (1993):
The alleged conflict between freedom and law is forcefully brought up once again today with regard to the natural law, and particularly with regard to nature. Debates about nature and freedom have always marked the history of moral reflection; they grew especially heated at the time of the Renaissance and the Reformation, as can be seen from the teaching of the Council of Trent.85 Our own age is marked, though in a different sense, by a similar tension. The penchant for empirical observation, the procedures of scientific objectification, technological progress and certain forms of liberalism have led to these two terms being set in opposition, as if a dialectic, if not an absolute conflict, between freedom and nature were characteristic of the structure of human history. At other periods, it seemed that “nature” subjected man totally to its own dynamics and even its own unbreakable laws. Today too, the situation of the world of the senses within space and time, physio-chemical constants, bodily processes, psychological impulses and forms of social conditioning seem to many people the only really decisive factors of human reality. In this context even moral facts, despite their specificity, are frequently treated as if they were statistically verifiable data, patterns of behaviour which can be subject to observation or explained exclusively in categories of psychosocial processes. As a result, some ethicists, professionally engaged in the study of human realities and behaviour, can be tempted to take as the standard for their discipline and even for its operative norms the results of a statistical study of concrete human behaviour patterns and the opinions about morality encountered in the majority of people.
Other moralists, however, in their concern to stress the importance of values, remain sensitive to the dignity of freedom, but they frequently conceive of freedom as somehow in opposition to or in conflict with material and biological nature, over which it must progressively assert itself. Here various approaches are at one in overlooking the created dimension of nature and in misunderstanding its integrity. For some, “nature” becomes reduced to raw material for human activity and for its power: thus nature needs to be profoundly transformed, and indeed overcome by freedom, inasmuch as it represents a limitation and denial of freedom. For others, it is in the untrammelled advancement of man’s power, or of his freedom, that economic, cultural, social and even moral values are established: nature would thus come to mean everything found in man and the world apart from freedom. In such an understanding, nature would include in the first place the human body, its make-up and its processes: against this physical datum would be opposed whatever is “constructed”, in other words “culture”, seen as the product and result of freedom. Human nature, understood in this way, could be reduced to and treated as a readily available biological or social material. This ultimately means making freedom selfdefining and a phenomenon creative of itself and its values. Indeed, when all is said and done man would not even have a nature; he would be his own personal life-project. Man would be nothing more than his own freedom!
85 Cf. Sess. IV, Decree on Justification Cum Hoc Tempore, Chap. 1: H. Denzinger-A Schönmetzer, Enchiridion Symbolorum Definitionum et Declarationum de Rebus Fidei et Morum, 1521.
— Veritatis Splendor 46