There is a lot of misunderstandings about the role of Church Councils throughout the history of the Catholic Church, even by Catholics themselves.
In the gradual revelation of all Truth by the Holy Spirit, not all the teachings of the Church were very widely defined even though widely accepted by the faithful. In the liturgy, Scripture readings were used and Feast days developed, together with direct revelations of God through chosen souls who we call mystics who possessed charismatic gifts of prophecy and knowledge. As St Augustine proclaimed and Dei Verbum, the Vatican II document reiterated; “God, the inspirer and author of both Testaments, wisely arranged that the New Testament be hidden in the Old and the Old be made manifest in the New.”
Do you agree with this statement, Just asking4? This is the key to the future revelations of teachings that you deny are “in the Bible”.
Jesus told His disciples there was too much to take immediately but He would reveal all and this is how it was. The prefigurng of the Chair of Peter by the Chair of Moses is an excellent example.
Whenever there was a conflict about a Church teaching that the Magisterium believed to be serious, a Church Council was called just as the pattern was set by the Council of Jerusalem in Acts. In fact Peter got up and addressed the assembly, claiming his leadership; “My brothers, you know perfectly well that in the early days, God made His choice among you: the pagan were to hear the Good News from me and so become believers.” Acts 15: 7-8. The conflict was resolved by the Council and the Truth was dogmatically declared in a much deeper explanatory manner so that never again within the Church would that heresy arise.
The Council of Trent had a huge task of dealing with all the heresies brought about by the Protestant Reformation, which incidentally was actually a deformation in the view of the Catholic Church. There was no doubt reform was needed, but not the Schism that followed. Sola Scriptura and Sola Fide wreaked havoc as did Luther’s attempts at discarding certain books of Scripture. Both these major heresies were addressed together with correction of other false teachings which abounded caused by the diverse interpretations of Scripture which divisions grow by the day. The definitive listing of the books of the Bible which of course included the DCs was the final reiteration of the true Canon of the Bible. They were not added at Trent, just as the teaching on the True Presence of Jesus in the Eucharist was not changed or added to. The term Transubstantiation was coined to make absolutely clear what had been taught from the beginning from Jesus teaching in John Ch 6.
When Church Councils declare Dogmas from the Chair of Peter, (the Pope reigning at the time), much previous study of the writings of the Early Church Fathers, teaching from Scripture, how it has been understood and believed, used in feast day celebrations, and taught in papal Encyclicals; even art is considered as seen by the many famous paintings of the Assumption of Our Lady, centuries before the Dogma in 1950 Each Dogma takes years of preparation on the part of Theologians and Scripture scholars renowned throughout the world. When the Pope is satisfied after long prayer and exhortation of the Holy Spirit, he will declare the dogma. Another example is the dogma of Papal Infallibility which has nothing to do with papal sinning. Not one of the few “bad” Popes defined a dogma or changed or denied any teaching (as far as I know).
Incidentally, the Council of Trent, in correcting another heresy of unbelief of the Protestants viz; “Whoever refuses to believe in miracles let him be anathema.” Ironically, just as many Protestants have come round to a belief in the True Presence as many Catholics have turned away finding the teaching “too hard to take”: so many Charismtic Protestants believe in miracles, manifested in prophecy and healings, spiritually and physically.