From Pope St. John Paul II’s encyclical Fides et Ratio (1984):
No less dangerous is pragmatism, an attitude of mind which, in making its choices, precludes theoretical considerations or judgements based on ethical principles. The practical consequences of this mode of thinking are significant. In particular there is growing support for a concept of democracy which is not grounded upon any reference to unchanging values: whether or not a line of action is admissible is decided by the vote of a parliamentary majority.105 The consequences of this are clear: in practice, the great moral decisions of humanity are subordinated to decisions taken one after another by institutional agencies. Moreover, anthropology itself is severely compromised by a one-dimensional vision of the human being, a vision which excludes the great ethical dilemmas and the existential analyses of the meaning of suffering and sacrifice, of life and death.
The positions we have examined lead in turn to a more general conception which appears today as the common framework of many philosophies which have rejected the meaningfulness of being. I am referring to the nihilist interpretation, which is at once the denial of all foundations and the negation of all objective truth. Quite apart from the fact that it conflicts with the demands and the content of the word of God, nihilism is a denial of the humanity and of the very identity of the human being. It should never be forgotten that the neglect of being inevitably leads to losing touch with objective truth and therefore with the very ground of human dignity. This in turn makes it possible to erase from the countenance of man and woman the marks of their likeness to God, and thus to lead them little by little either to a destructive will to power or to a solitude without hope. Once the truth is denied to human beings, it is pure illusion to try to set them free. Truth and freedom either go together hand in hand or together they perish in misery.106
105 Cf. John Paul II, Encyclical Letter Evangelium Vitæ (25 March 1995), 69: Acta Apostolicæ Sedis [AAS] 87 (1995), 481.
106 In the same sense I commented in my first Encyclical Letter on the expression in the Gospel of Saint John, “You will know the truth, and the truth will set you free” (8:32): “These words contain both a fundamental requirement and a warning: the requirement of an honest relationship with regard to truth as a condition for authentic freedom, and the warning to avoid every kind of illusory freedom, every superficial unilateral freedom, every freedom that fails to enter into the whole truth about man and the world. Today also, even after two thousand years, we see Christ as the one who brings man freedom based on truth, frees man from what curtails, diminishes and as it were breaks off this freedom at its root, in man’s soul, his heart and his conscience”: Encyclical Letter Redemptor Hominis (4 March 1979), 12: AAS 71 (1979), 280-281.
— Fides et Ratio 89-90