In this work, Paul O'Callaghan underscores the significance of truth as the object of witnessing. In the contemporary era, characterized by an abundance of information emanating from myriad sources, the significance of authentic witnessing has become paramount. The testimony is first and foremost that of those who put their lives on the line and thereby seal the credibility of their witness. This book meticulously delineates the rationale, value, and imperative of receiving and embracing the testimony of truth, particularly that of the primary witness who has asserted: "I am the Truth".

Balázs M. Mezei, Corvinus University; St. Stephen Academy of Sciences, Budapest

Any book by Paul O'Callaghan is a major publishing event, given the near-uniqueness of his theological and philosophical breadth and his rare mastery of the relevant scholarship in all the European languages. This book is no exception. Building upon his prior work in theological anthropology and offering something of a sequel to his study of Christianity and modernity, Faith Challenges Culture, O'Callaghan places the human person and personal encounter-witnessing-at the center of evangelization, just as Christ is the true witness to the Father, and the apostles to Christ. As O'Callaghan shows, witness is rejected as a test of truth by Nietzsche, Heidegger, and Vattimo and embraced by Kierkegaard, Marcel, and Balthasar. An immensely valuable book.

Matthew Levering, James N. Jr. and Mary D. Perry Chair of Theology, Mundelein Seminary

At a time marked by uncertainty and relativism, I found in this book a convincing reminder that witness lies at the heart of evangelization. The author skillfully weaves philosophy, theology, and lived experience, offering an account of the credibility of Christianity that is both rigorous and engaging. This work does more than analyze-it inspires the reader to rediscover the power of truth embodied in authentic lives of witness.

Juan Alonso, School of Theology, University of Navarra (Spain)