Book excerpt: The relationship between nature and grace is a key debate in Fundamental theology. The understanding of how nature and grace relate to each other is also a critically important part in comprehending the underpinnings of Western secular culture, and therefore, how best to evangelise it. This book compares John Milbank and Joseph Ratzinger, two relatively recent theologians, who have both drawn from the insights of Henri de Lubac, and have attempted to address the challenge that secular culture presents to the mission of the church. In demonstrating and comparing how each author’s approach to the nature-grace couplet consequently determines their respective approach to secular culture, it is hoped that responses to the challenge of secular culture might be more comprehensively considered.