Abstract

In lieu of an abstract, here is a brief excerpt of the content:Dei Filius IV:On Theological Method and the Nexus MysteriorumConor McDonough, O.P.From the point of view of Church history, chapter 4 of Dei Filius might seem like dull terrain. Dei Filius as a whole has been regarded as the "forgotten decree" of the First Vatican Council,1 and the principal controversies during its passage through the Council were, for the most part, proxy battles over papal infallibility.2 Of the whole document, the fourth chapter, on the relationship between faith and reason, provoked the fewest interventions from the Council fathers.3 On April 24, 1870, the day the constitution was passed unanimously by the Council fathers, an American bishop, John McQuaid of Rochester, described Dei Filius in a letter: [End Page 891] "There are some obstruse [sic] metaphysical points which few can fathom and certainly will never trouble the brains of any but a German philosopher for whose especial benefit they seem to have been made. The rest is quite simple theology."4Whether McQuaid regarded chapter 4 as "obstruse" or "simple theology" is anybody's guess, but it is clear that it was indeed composed with German thinkers in mind, especially the rationalists Georg Hermes (1775–1831) and Anton Günther (1783–1863),5 and its composition and passage through the conciliar process was also largely the work of Germanophone theologians: Johann Baptist Franzelin, S.J. (1816–1886), Joseph Kleutgen, S.J. (1811–1893), and Bishop Vincent Gasser (1809–1879).6 It may not have provoked much debate on the floor of the Council, but its careful pronouncements on faith and reason were a vital antidote both to rationalism and fideism. More than that, Dei Filius outlines key points of theological method, making explicit what had long been implicit in the work of theologians. As we shall see, these insights are of enduring relevance to the wise practice of theology.Reason's Work and the Mysteries of FaithWhat is the role of reason in relation to the mysteries of the faith? Or, to put it another way, how does theology proceed? Rationalism and fideism both answer these questions badly. Speaking very broadly, we can say that rationalism, in its more extreme variety, claims that reason can actually construct the whole edifice of faith. God has revealed mysteries of the faith, like his triunity, for example, but reason can—so claim the rationalists—arrive independently at the same mysteries of faith (rendering them, one might add, somewhat less mysterious).Fideism, in its extreme forms, gives hardly any role to reason at all: we receive revelation, and we repeat and transmit it, with little room for reflection and growth in understanding. The light of faith, according to [End Page 892] this view, makes redundant the natural light of reason, at least in the realm of the revealed truths.Dei Filius rules out these two extremes: reason does not independently reconstruct the mysteries of faith, nor does it merely repeat these mysteries. But the constitution does not limit itself to ruling out extremes. In chapter 2 it affirms the capacity of human reason to know God's existence independently of revelation, and in chapter 4 it develops a positive account of the role of reason within faith, enunciating basic principles of sound theological method. Having affirmed in this final chapter a "twofold order of knowledge," accessible by natural reason and faith, respectively, and having affirmed the existence of truths "which, unless they are divinely revealed, are incapable of being known," the constitution outlines the kind of work human reason can carry out on these mysteries:Reason, enlightened by faith, when it seeks persistently, piously, and soberly, does achieve by God's gift some understanding—a most profitable understanding—of the mysteries, both by analogy from what it knows naturally, and by the connection of these mysteries with one another and with the final end of humanity; but reason is never rendered capable of penetrating these mysteries in the way in which it penetrates those truths which form its proper object.7Avoiding any hint of rationalism, Dei Filius indicates here two methods or paths8 by which reason can gain "some understanding" of the mysteries revealed by God...