One of the common ideas in the current ecumenical climate is that Vatican II altered or at least has the potential to alter the relationship between Protestants and Roman Catholics. There were major changes made at Vatican II, particularly liturgical changes and softening of the RC Church’s stance towards those outside the church. But many central assertions remained. One of the greatest divides, if not the greatest, between Roman Catholics and Protestants is the authority of the Bible and the authority of tradition. Vatican II did not alter the Roman Catholic Church’s view on tradition and Scripture. Here are some quotes from Vatican II

The task of authentically interpreting the word of God, whether written or handed on, has been entrusted exclusively to the living teaching office of the Church.

Sacred tradition, sacred Scripture, and the teaching authority of the Church, in accord with God’s most wise design, are so linked and joined together that one cannot stand without the others, and that all together and each in its own way under the action of the one Holy Spirit contribute effectively to the salvation of souls.

It is not from sacred Scripture alone that the Church draws her certainty about everything that has been revealed. So, both sacred tradition are to be accepted and venerated with the same sense of devotion and reverence.

Sacred tradition and sacred Scripture form one sacred deposit of the word of God, which is committed to the Church.

Matthew Barrett comments on these quotes saying,

While the document goes on to say, “this teaching office is not above the word of God, but serves it,” Vatican II cannot meant this in the way that the Reformers did, for it then says this teaching office “draws from this one deposit of faith everything which it presents for belief as divinely revealed.” So while this teaching office may serve the Word of God, it originates from the one holy deposit along with Scripture and must be equally revered as God’s Word.

There is debate in Roman Catholic circles about what all of this means. But that is largely irrelevant. The institution of Roman Catholicism is built on tradition plus Scripture. In the end, unity is impossible if one group accepts two divinely received sources of authority and the other group accepts only one and rejects the other.