" The question before us is this: Is the Council of Trent’s teaching on justification the church’s final word? Emphatically not. Rome has developed its doctrine of justification, and it will doubtless continue to do so. None of the ecumenical councils, not even Chalcedon or Nicea, is terminal in the sense that it ends all possible development.
They are not terminal, but they are decisive. Rome can indeed develop the views expressed at Trent. What it cannot do without radically altering its view of itself is repudiate or “correct” Trent. Those who look for such a repudiation, or who think they have already found it, are whistling in the dark.
Source: Sproul, R.C., Faith Alone : The Evangelical Doctrine of Justification (Grand Rapids: Baker Books, 1995) pp.120-121