Prima scriptura is sometimes contrasted to sola scriptura, which literally translates "by the scripture alone". The former doctrine as understood by many Protestants—particularly Evangelicals—is that the Scriptures are the sole infallible rule of faith and practice, but that the Scriptures' meaning can be mediated through many kinds of secondary authority, such as the ordinary teaching offices of the Church, antiquity, the councils of the Christian Church, reason, and experience.
However, sola scriptura rejects any original infallible authority other than the Bible. In this view, all secondary authority is derived from the authority of the Scriptures and is therefore subject to reform when compared to the teaching of the Bible. Church councils, preachers, Bible commentators, private revelation, or even a message allegedly from an angel or an apostle are not an original authority alongside the Bible in the sola scriptura approach.
The Dogmatic Constitution on Divine Revelation is clear on the total equality of Scripture with Sacred Tradition when it says that "both Sacred Tradition and Sacred Scripture are to be accepted and venerated with the same sense of loyalty and reverence" because together they "form one sacred deposit of the word of God, committed to the Church." So, in one sense, Scripture has no primacy over Tradition, but an ancient tradition holds that the word of God, though equally authoritative in whichever form it comes, comes primarily in the form of Sacred Scripture, and thus we should seek for Sacred Doctrine primarily in the Scriptures. As Thomas Aquinas said:
...acred doctrine...properly uses the authority of the canonical Scriptures as an incontrovertible proof, and the authority of the doctors of the Church as one that may properly be used, yet merely as probable. For our faith rests upon the revelation made to the apostles and prophets who wrote the canonical books, and not on the revelations (if any such there are) made to other doctors.
For this reason, some sources say that prima scriptura is the normative Catholic approach. Yves Congar referred to prima scriptura as the "normative primacy of Scripture" as he described the work of Augustine of Hippo and Thomas Aquinas. Pope John Paul II in an address to academics in 1986 said, "Theology must take its point of departure from a continual and updated return to the Scriptures read in the Church." This statement has been taken by some as support for interpreting the Church's teaching in terms of the prima scriptura perspective.