If all of human knowing is done through some combination of faith and reason, it is essential for Catholic teachers to consider the particular synthesis of Christian faith and reason, the worldview that follows from this synthesis, and its tremendous impact on human knowing and human culture. Indeed, it is difficult to imagine any worldview with a comparable impact across the whole range of human endeavors. As the American Catholic writer Walker Percy cheekily put it when asked about the reasons for his own conversion to Catholicism: “What else is there?”