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.
“I was raised Evangelical and just recently started looking, with an open mind, into the Catholic Church. You guys have been instrumental in my leaning more and more towards coming home to the Catholic Church.”
"I did not think anything like it or anything so holy could be received in this life."
~ Richard Rolle of Hampole, 14th century solitary and writer, in describing passage through the purgative, illuminative and contemplative ways.