The reciprocal relationship between faith and reason has been a constant theme in Catholic intellectual history, and it explains why the Catholic intellectual tradition is so rich, strong and full, perhaps unlike anything else in the world. In his famous Regensburg address and elsewhere, Pope Benedict XVI stressed the perennial relevance of Pope John Paul II's encyclical Fides et Ratio (Faith and Reason) and the need for Faith to purify Reason, and for Reason to purify Faith. The question is how to make this happen and why it has become necessary more than ever to stress their connection and mutual relevance. Let this book be your guide in answering the many questions you might have.