Oberman begins section three by distinguishing between “Tradition I” (T1) and “Tradition II” (T2). T1 stands for what has been described as the “exegetical tradition of interpreted scripture,” whereas T2 represents the “two-sources theory which allows for an extra-biblical oral tradition” (p. 280). As we have seen, both T1 and T2 have their medieval supporters. Moreover, as was mentioned previously, the canon lawyers in the Basilean line follow the two-sources theory with both sources requiring equal respect. The doctors, in contrast, begin to develop the oral tradition in a more subtle fashion. “In theory the material sufficiency of Holy Scripture is upheld long after it has been given up in actuality. The key term of this development is the word ‘implicit’ and the history of this term is one of increasing loss in content. When then finally the two propositions—‘Holy Scripture implicitly says’ and ‘Holy Scripture silently says’—are equated, the exegetical concept of Tradition I has fully developed into what we called Tradition II” (pp. 281-282).
With this history in mind, Oberman suggests that we will better understand the Council of Trent and later Roman Catholic theology [pre-Vatican II]. In light of everything that has been said up to this point, we see the difficulty of tracing T1 to the early part of the Middle Ages because in this period T1 and T2 cannot be sharply separated. This conflation or blurring of lines between the two has to do with the fact that those adhering de facto to T2 continue to claim to support the material sufficiency of scripture. Yet, according to Oberman, after the nominalists (e.g., Ockham, Gerson, d’Ailly and Biel) pave the way for Trent’s reception of T2, the historian can begin to gain a clearer understanding of the differences on both sides of the argument—an argument which is not one of Scripture verses tradition (p. 282). For example, Wyclif, Hus, and Gansfort do not oppose Scripture to tradition, rather they argue for T1 over T2. “True to Vincent’s five restrictive requirements for an authoritative tradition, they defend along with the material sufficiency of Holy Scripture the authority of the exegetical tradition whenever there is a common and explicit witness of the Fathers, in particular of the four great doctors of the Church: Augustine, Jerome, Ambrose and Gregory” (p. 282). Nor do the adherents of T1 deny the importance of episcopal succession for the purpose of preserving the truth. “They indeed regard tradition as the execution of the custodian’s task of the Church. But in contrast to those holding to Tradition II, the emphasis falls rather on the successio doctorum than on the successio episcoporum” (pp. 282-283).
As Oberman argues, Trent represents T2, and the Reformers represent T1. Oberman again reiterates that just as was the case in the later Middle Ages, so too is it the case in the period of Reformation and Counter-Reformation that the conflict is one of a clash of between two concepts of tradition (T1 and T2). Luther of course taught what is known as the sola scriptura principle. However, one should not understand this principle as denying the coinherence of Church and Scripture, but rather as operating within the context of T1, not T2. Throughout the many theological changes that Luther underwent, he never denied the importance of and need for T1.
With regard to the historical details of Trent, Oberman states that in its fourth session, the Council of Trent endorsed T2. In other words, by sanctioning the two-source theory, the extra-scriptural apostolic tradition is to be esteemed on the same level as Holy Scripture. “This implies not only that the successio fidei coincides with the successio episcoporum, but also an elevation of the authority of the Church above the authority of the canonized apostolic kerygma. Due to the restrictive localization of the testimonium internum of the Holy Spirit in the teaching office of the Church, Holy Scripture can only have a mute authority” (p. 286).
Oberman next cites two scholars, Joseph Geiselmann and Father George Tavard who have argued that the main post-Tridentine theologians have misinterpreted Trent as promoting a two-sources theory. Geiselmann and Tavard claim that the Council implicitly accepted the sufficiency of Scripture, and that they viewed tradition as the viva vox evangelii—which would in effect reflect a T1 position. Oberman, however, disagrees with Geiselmann’s thesis (which implicates Tavard as well) for the following reasons, which I will quote in toto:
(a) “The partly-partly (partim-partim) formula of the original draft of the Tridentine decree on the respective authorities of Scripture and tradition cannot be explained away as a product of nominalistic philosophy as Geiselmann suggests. Though one has to cede to the nominalistic theologians the honour of having made the two-sources theory ripe for its official reception at Trent, the formulation ‘partly-partly’ as such is rare and has not yet been traced to a nominalist theologian. The more current translation of the Basilean passage, ‘some—and others’ (quasdam-quasdam), is used by Gabriel Biel but can be traced back to the early medieval canonists. In view of such textual history, one would be well advised not to give too much weight to the change of the initial ‘partly-partly’ to the copulative ‘and’ (et). All three formulations render satisfactory St. Basil’s own choice of words (ta men, ta de).”
(b) “This conclusion is borne out by the statement of the cardinal legate Cervini who announces on 6th April 1546 after a night spent on the revision of the original draft that the final version is ‘in substance’ the same. This would hardly seem compatible with the idea that the Council changed its mind.”
(c) “The energetic protest against the ‘partly-partly’ formulation which Geislemann cites as the cause for the alleged change proves to be limited to two representatives, Bonacci and Nacchianti, of which the first stands under suspicion of heresy on points related to Scripture and tradition and the second was once called ‘avid for novelties’.”
(d) “The Catechismus Romanus (1566) quite clearly interprets ‘and’ (et) as ‘partly-partly’ (partim-partim) when it states that the Word of God is distributed over scripture and tradition” (pp. 287-288).
The bottom line is that according to Oberman, the Council of Trent clearly teaches a two-sources theory in its admission that all doctrinal truths are not found in Scripture. Tradition is a second source that “by adding its own substance complements Holy Scripture. The gradually eroded connection between explicit and implicit truths has been snapped; the exegetical tradition has been transformed into Tradition II” (p. 288). Oberman ends this section by noting that Geiselmann’s thesis has exercised much influence on a large segment of contemporary Roman Catholic theology. Moreover, though Geiselmann desires to demonstrate the error of the two-sources theory, this does not mean that he moves us to a T1 position.