Plantinga has devoted his scholarly life to answer the question whether the Christian faith can be justified, and this book is the fruit of forty years of excellent work. How can the Christian faith be justified? The usual answer is to give arguments for the truth of Christian convictions (from popular writers like Josh McDowell to first rate philosophers such as Richard Swinburne). Plantinga took a different route by asking: what is justification (or warrant for knowledge)? Why must Christians prove his convictions based on principles accepted by non-Christians? The first part of the book review and refute different theories about how Christian faith may be justified (e.g. evidentialism) or dismissed (e.g. Marx and Freud). The second part argues that experience of faith of an ordinary Christian is a perfect justification for the Christian faith, unless one can show that the Christian faith is likely to be false. The third part looks at reasons for arguing Christian faith is likely to be false (biblical criticism, pluralism, evil and suffering). Plantinga think that the truth of Christian faith cannot be demonstrated or proven, but he provides coherent and compelling reasons that faith is a sufficient justification for Christian belief. The arguments sometimes get very complicated, but Plantinga is exceptionally clear and precise and this work is more accesible to non-philosophers than his previous works.