Nova et vetera

Consider the words of Justin Martyr written in the middle of the second century after the birth of Christ and after Justin's conversion to Christianity:

Philosophy is indeed one's greatest possession, and is most precious in the sight of God, to whom it alone leads us and to whom it unites us, and in truth they who have applied themselves to philosophy are holy men.¹

In addition to the praise heaped upon the philosophers, among whom Justin had counted himself before his conversion,² the text is one of the earliest pieces of evidence for the historical reality of Christian intellectual engagement with pagan or secular philosophy. Whether that engagement proved spiritually fruitful or sterile in any particular age or any particular tradition of philosophy, Christian intellectuals have often sought out engagement with philosophy as an inherent task of the intellectual life of the Church, in order to pursue and develop the understanding of Christian revelation and the mode of life informed by it. One lasting result of the impetus represented by Justin is to be found even now in the normative requirement in Catholic education that, at a certain stage of development, anyone who receives a [End Page 49] serious Catholic education must be introduced to serious philosophical reflection on where we came from, what we are, and where we are born to go.

In addition, one of the general points John Henry Newman made in The Idea of a University is that the human mind looks for unity in the diversity of intellectual disciplines it pursues. In search of this unity, it seeks a kind of primary discipline that takes into account the truths discovered throughout the other disciplines as it seeks to understand what it can of the whole of reality, not just its parts. But Newman also pointed out that, in the absence of such a unifying discipline, practitioners of each particular discipline will often claim for their particular discipline the prize of being primary—of being the discipline by which all others must be understood and judged.³

Take classical and modern physics. A familiar claim of some physicists, but even more so of non-physicist physicalists, is that physics is the fundamental intellectual discipline for understanding what is real. All reality, living reality, historical reality, moral reality, indeed perhaps even literary reality, must be reduced to reality as described by the physicists or rejected as unreal or epiphenomenal, or in a kinder, gentler vein, non-reductively emergent and supervenient. Whichever position is taken, whether reduction, non-reductive emergence, or epiphenomenalism, the thought is that the real work of the really real is done by reality as described by physics, either in its actual contemporary state or, more likely, in an idealized future state always on the horizon of where physics presently is. We are really atoms spinning ceaselessly in the void, mostly empty space, the warp and woof of a four-dimensional space-time manifold, or congeries of strings in an even more bizarre thirteen-dimensional manifold, or whatever was said most recently to surpass what was said before that by the leading physicists in California or Cambridge.

However, anyone who has actually practiced physics knows that, even when uttered by a physicist, these are not claims of physics, but about physics. What prompts them is the sense that there is no intellectual discipline other than contemporary physics itself that can both understand the achievements of physics and integrate them into a larger intellectual comprehension of reality as a whole. These claims about physics nicely display Newman's point about the way in which a particular discipline, in the absence of a larger more comprehensive discipline, can take on an importance for its practitioners well beyond its disciplinary limits. [End Page 50]

In the case of physics, if a more comprehensive unifying discipline is not to be found, this attitude is not entirely unjustified, for Newman's point is partly Aristotelian. Aristotle had pointed out that, if one cannot show that unchangeable, and thus non-physical beings, exist, then what Aristotle called "first philosophy" would just be physics as he understood it, the science of...