Trent Session 4 — equal piety for unwritten traditions restricted to first two kinds
They therefore confine Trent's Session 4 rule — receive unwritten traditions with the same piety as the Canonical books — to the first two kinds alone (Divine and Apostolic).
The Council says: seeing Gospel truth and discipline live in written books and in unwritten traditions received from Christ's mouth by the Apostles, or passed from the Apostles under the Spirit's dictation as if by hand down to us, the Synod, following the orthodox Fathers, receives and venerates with equal piety and reverence every Old and New Testament book (one God their author) and those faith-and-morals traditions spoken by Christ or the Spirit and kept by continual succession in the Catholic Church.
Latin
XV. Itaque ad duo tantum priora traditionum genera restringunt Decretum Concilii Tridentini, quod habetur Sessione quarta: ubi praecipitur ut traditiones non scriptae pari pietatis affectu suscipiantur atque ipsi libri Scripturae Canonicae. Verba Concilii sunt, Synodus perspiciens Evangelii veritatem & disciplinam contineri in libris scriptis, & sine scripto traditionibus, quae ipsius Christi ore ab Apostolis acceptae, aut ab ipsis Apostolis Spiritu sancto dictante, quasi per manus traditae, ad nos usque pervenerunt, Orthodoxorum Patrum exempla secuta, omnes libros tam Veteris quam Novi Testamenti, cum utriusque unus Deus sit author, necnon traditiones ipsas tum ad fidem, tum ad mores pertinentes, tanquam, vel ore tenus a Christo, vel a Spiritu sancto dictatas, & continua successione in Ecclesia Catholica conservatas, pari pietatis affectu & reverentia suscipit & veneratur.