What positions with regard to epistemology exist in Catholicism? Mostly sparked by debates regarding evolution, I have become curious what epistemological positions exist in Catholicism.

I understand the doctrinal priority of biblical texts, so from a Christian point of view they take precedence over scientific ideas in case they clash. Once those central texts are accepted as revelation, this seems to be internally consistent to me.

My question is with regard to which specific methods are used to arrive at the conclusion that the central texts are divinely revealed. Usually talks about this are filled with words like "logical", "rational", or other terms of a similar nature. What I never saw is a description of what constitutes logical or rational methods, how they are derived, how they lead to acceptance of what Christianity considers revelation, and how they disqualify the validity of other methods in case of conflicting results. Also, how do those same methods applied to the claims of other religions lead to rejection of those claims while leading to acceptance of a Christian position?

I am interested in the epistemological methods that the school(s) of theology that exist(s) within Catholicism use(s) to arrive at the conclusion that the bible is revelation, which seem to me to be necessarily a priori to biblical texts, or in other words: they cannot come from commandments within the texts.

(I posted the same question with regard to Islam on islam.se. Strictly speaking I am interested in the epistemological positions of all major Christian traditions, but have been advised to focus on one.)
There is actually an encyclical devoted almost entirely to this topic, St. John Paul II’s Fides et ratio, published in 1998.

In that encyclical, John Paul sets down some essential principles for reconciling the truths known through natural reason alone (reason unaided by faith) and revealed truths (those that can only be known though faith).

These principles can be summarized as follows:


There is never a conflict between truths known through natural reason alone (hereafter, I will refer to these as “truths of reason”) and truths that require revelation by God (hereafter referred to as “revealed truths”). If something is true, then it can never contradict another truth, whether revealed or not. All truth, in the end, comes from the Holy Spirit. (That is the gist of numbers 36-42; this idea is also the topic of the Dogmatic Constitution Dei Filius, from Vatican I.)
Although the Church does not endorse particular philosophical schools (including epistemological schools), the Church can say that those philosophies that fail to go beyond mere appearances, and do not seek their foundation, are not adequate tools for understanding the Faith (no 83). (The Pope is probably thinking of the philosophy of Immanuel Kant and his followers, who famously denied the knowability of the “noumenon,” or “thing-in-itself”. He is not saying that Kant has nothing good to contribute, but that agnosticism of the kind proposed by Kant is not helpful for understanding revealed truths.)
The Church should support the contribution of the empirical sciences. On the other hand, it should be recognized that the method employed by these sciences is not the only way to have access to the truth (nos. 83 and 88). Nor is there any fundamental contradiction between what the Faith teaches and what science proposes (no. 88). (Hence, as an example, if biology finds that all life forms have evolved ultimately from a single species, well and good; the perceived differences between this theory and what the Book of Genesis seems to propose can easily be overcome by understanding that the author of Genesis was not attempting to write a scientific treatise on the origin of species, nor are any of the truths actually asserted by Genesis in any way contradicted by the theory of evolution.)
The empirical sciences, philosophy, and theology—although all legitimate sources of truth—operate based on different principles and using different methods (no. 92). For example, the empirical sciences generally use the hypothetical-deductive method; philosophy (at least the kind advocated by the Pope) uses a method that deduces causes based on the observed effects (no. 83); theology begins with the truths that God has revealed and uses reason to draw out the logical conclusions (that is the gist of Chapter II, nos 16-20).


More à propos the O.P.’s particular questions:

Regarding the reliability (or inerrancy) of the Scriptures, the epistemological path is as follows: canonicity -> inspiration -> inerrancy. At the end of the day, the reliability of the Scriptures is a truth of faith, not a truth of reason. Although the Scriptures can be submitted to tests proposed by the modern sciences, those sciences cannot “prove,” as one proves a mathematical theorem, that the Scriptures are reliable. Rather, this truth depends epistemologically on revelation from God, which in turn, is mediated by the Church (which is to say, we have access to the truths revealed by God thanks to the Church, who has the authority to teach those truths).

The way the Church has shown the reliability of the Scriptures is by affirming their canonicity. In the fourth and fifth centuries, in various places but most notably in Carthage and Rome, synods of bishops sifted through the evidence and chose all those works, and only those works, that could be considered inspired by the Holy Spirit. Their criteria were (1) fidelity to accepted Catholic doctrine (2) continuous use in liturgical celebrations (3) for the New Testament, traceability to the authority of an Apostle. The lists produced in the synods of Carthage and Rome are identical in substance with the 73 books of the Catholic Bible. (These can by found in the Enchiridion Symbolorum edited by Denzinger and Hünnermann.) The canon was not, however, definitively or solemnly “closed” until the Council of Trent (in response to changes in the canon proposed by Protestant reformers).

Canonicity, or inclusion in the Canon of Scripture, is the Church’s judgment that a particular work is inspired—which means, essentially, that the Holy Spirit is to be understood as the primary author. If God is the primary author, it follows that everything affirmed as true by the human author (and the whole problem of exegesis hinges on what the author actually meant to affirm) must be considered as affirmed by God—hence, true. (See Catechism of the Catholic Church [CCC] nos. 105-108.)

That is the epistemological path that the Church proposes for the Scriptures, and if an epistemological school is to be compatible with the Catholic Faith, then it must fall within these parameters.

(One sees immediately, for instance, that Kantian agnosticism will make the passage from canonicity to inspiration very difficult. On the other hand, Platonic-inspired theories of knowledge based on recollection or the Augustinian_rationes seminales_, as well as Aristotle’s more experience-based approach, could be made to work.)

In fact, substantially the same epistemological path is to be used for any revealed truth: the Church has the authority to interpret (but not invent!) the truths revealed to it by God (keeping in mind that the definitive revelation was given in the person of Jesus Christ, and that there is no more “public” revelation beyond him, and nothing fundamental to be added to the deposit of faith after the age of the Apostles). These constitute the so-called deposit of faith (CCC no. 84), entrusted to the Church, especially to the Apostles and their successors the bishops. What the Church, through her teaching office, or Magisterium, after consulting the Scriptures and also the Church’s constant tradition, affirms to be an article of faith, the faithful are bound to believe with divine and catholic faith. (An excellent summary of how faithful Catholics are bound believe various Church teachings can be found by then-Cardinal Joseph Ratzinger’s commentary on the profession of faith required in various situations.)

In conclusion: the Church gives full liberty to adopt any epistemological theory, so long as it does not clearly deny the very possibility of gaining access to revealed truth.