From Pope St. John Paul II’s encyclical Fides et Ratio (1984):
The two requirements already stipulated imply a third: the need for a philosophy of genuinely metaphysical range, capable, that is, of transcending empirical data in order to attain something absolute, ultimate and foundational in its search for truth. This requirement is implicit in sapiential and analytical knowledge alike; and in particular it is a requirement for knowing the moral good, which has its ultimate foundation in the Supreme Good, God himself. Here I do not mean to speak of metaphysics in the sense of a specific school or a particular historical current of thought. I want only to state that reality and truth do transcend the factual and the empirical, and to vindicate the human being’s capacity to know this transcendent and metaphysical dimension in a way that is true and certain, albeit imperfect and analogical. In this sense, metaphysics should not be seen as an alternative to anthropology, since it is metaphysics which makes it possible to ground the concept of personal dignity in virtue of their spiritual nature. In a special way, the person constitutes a privileged locus for the encounter with being, and hence with metaphysical enquiry.
Wherever men and women discover a call to the absolute and transcendent, the metaphysical dimension of reality opens up before them: in truth, in beauty, in moral values, in other persons, in being itself, in God. We face a great challenge at the end of this millennium to move from phenomenon to foundation, a step as necessary as it is urgent. We cannot stop short at experience alone; even if experience does reveal the human being’s interiority and spirituality, speculative thinking must penetrate to the spiritual core and the ground from which it rises. Therefore, a philosophy which shuns metaphysics would be radically unsuited to the task of mediation in the understanding of Revelation.
The word of God refers constantly to things which transcend human experience and even human thought; but this “mystery” could not be revealed, nor could theology render it in some way intelligible, 102 were human knowledge limited strictly to the world of sense experience. Metaphysics thus plays an essential role of mediation in theological research. A theology without a metaphysical horizon could not move beyond an analysis of religious experience, nor would it allow the intellectus fidei to give a coherent account of the universal and transcendent value of revealed truth.
If I insist so strongly on the metaphysical element, it is because I am convinced that it is the path to be taken in order to move beyond the crisis pervading large sectors of philosophy at the moment, and thus to correct certain mistaken modes of behaviour now widespread in our society.
102 Cf. First Vatican Ecumenical Council, Dogmatic Constitution on the Catholic Faith Dei Filius, IV: Denzinger, Heinrich, and Adolf Schönmetzer, Enchiridion symbolorum definitionum et declarationum de rebus fidei et morum 3016.
— Fides et Ratio 83