"The work of priestly formation these days must involve a strong catechetical component since so many of our people have been deficiently formed. The resources you provide are allowing the Church to do a better job in preparing Catholics to know and defend their faith more effectively."
~ Fr. James, Director of Priestly Formation, Pittsburgh
The Catholic Church bases her teaching upon one source: The word of God. This divine revelation is transmitted in two ways: through Scripture and apostolic tradition. Many assume that only the writings of the apostles are the word of God. However, their oral transmission of the faith is also considered the word of God (1 Thess. 2:13). Few Protestant groups today accept the validity, let alone the authority, of tradition. In fact, many believe that Scripture is the only definitive source of divine truth.
Protestants claim the Bible is the only rule of faith, meaning that it contains all of the material one needs for theology and that this material is sufficiently clear that one does not need apostolic tradition or the Church’s magisterium (teaching authority) to help one understand it. In the Protestant view, the whole of Christian truth is found within the Bible’s pages. Anything extraneous to the Bible is simply non-authoritative, unnecessary, or wrong—and may well hinder one in coming to God.
"Where the bishop is, there is the community, even as where Christ is, there is the Catholic Church."
~ Ignatius of Antioch (Smyrn., viii, 2) circa A.D. 110, laid down this principle on true union with the Church, versus schism; all the more impressive because his casual use of the word "Catholic" demonstrates the widespread acceptance of the term at a very early date.