By What Authority? An Evangelical Discovers Catholic Tradition

In this newly updated, expanded version of his popular work of apologetics, Shea presents a lively and entertaining look at his conversion to Catholicism from Evangelicalism and his discovery of Christian tradition. As an Evangelical, Shea accepted the principle of "sola scriptura" (Scripture alone) as the basis of faith. Now as a Catholic convert, he skillfully explains how and why Sacred Tradition occupies a central role in Divine Revelation.

Tracing his own journey of intellectual and spiritual awakening, Shea begins by looking for a rejoinder to those modern-day false prophets who would claim that Scripture itself is not to be trusted, and ends with his conviction that tradition, as explained by the Catholic Church, is the only sure guarantee of the truth of the revelation of Jesus Christ.

Mark Shea is an award-winning columnist for the National Catholic Register, and a frequent contributor to Our Sunday Visitor and other Catholic publications. He is a popular blogger, and frequent guest on radio and television.

Praise for By What Authority:

"A crystal clear and compelling case for Sacred Tradition, on the basis of logic, history and Scripture. It is simply the best I have found."
- Scott Hahn, Author, Rome Sweet Home

"This is not just another book of Catholic apologetics. It is not only a good think; it's also a good read. Concrete, clear, compelling arguments."
- Peter Kreeft, Author, Handbook of Catholic Apologetics

"An important service for Catholics, Evangelicals and all those seeking a firm grounding for Faith. Shea argues powerfully for the extra-biblical authority of Sacred Tradition as a depository and source of revelation side by side with the Bible, to which it testifies and which it interprets with authority."
- Russell Shaw, Author, American Church