This is probably one of Lewis's most famous and oft-quoted works, and for good reason. It is an honest and intelligent - not to mention brilliantly written - examination of the many facets of the Christian faith and human nature: the existence of and belief in God, the Trinity, faith, love, pride, morality etc. Although written during World War Two, the subjects explored still resonate powerfully with contemporary concerns.
I found the opening chapters particularly helpful in presenting a well-argued case for the rational foundations of Christianity, or at least belief in the existence of God. It offers a challenge to Christians to question the intellectual grounds for their faith, and the reassurance that sufficient answers can be found. Non-Christians looking to investigate the rational basis of Christianity, or of religion in general, will also find this an accessible and thought-provoking read.
The book is also an ideal place to start for anyone thinking to dip into the non-fiction works of C. S. Lewis. No book in my opinion gives the reader a better first taste of the prolific author's delicious prose, keen intellect and razor-sharp wit.
I cannot recommend this book more. For the Christian, for the non-Christian, and for the fan of `good books': this is a must-read!