The Screwtape Letters

This book by C.S. Lewis is a collection of letters from a demon (Screwtape) to it's also demonic nephew (Wormwood). We know the content of the correspondence of the latter to the former by the way the Screwtape answers to its nephew. Anyway, this brilliant book is a glimpse into how Lewis saw the temptation working, by driving us apart from Gid, from His love, from the Church, and the virtues. Lewis poses some interesting questions about how we can deviate from the Truth and become numb to God's presence in our lives. The Screwtape Letters is a short book, but with an unique perspective of the spiritual warfare.