Sun Tzu taught, “If you know the enemy and know yourself, you need not fear the result of a hundred battles.” With that maxim in mind, if you read The Screwtape Letters by C.S. Lewis, you will gain insight into the enemy’s tactics, unlike perhaps any other source.
Lewis said this book was an easy book for him to write, but it gave him no joy to write it. Exposing the dark strategies of satan and his ugly cohort is indeed a joyless business. But even the apostle Paul tells us that we shouldn’t be unaware of the devil’s schemes.
If you are a Christian and you read this book, you need to reverse your thinking. This book is a series of letters from Screwtape, a more experienced demon, to his nephew Wormwood who has just been given his first “patient” to seduce into hell. Whereas Christians call God their Father, in this book Screwtape refers to satan as “our Father” and God as “the Enemy.”
Perhaps the most insightful part to me of this amazing book is the subtlety of the temptations which are employed to trip up Christians and keep seekers away from the truth. In fact, at several points Screwtape warns Wormwood that he is trying too hard to use something huge to bring down his patient when only the smallest of things will do the trick.
I would encourage newer Christians to wait a while to read this book. In the meantime, read the Bible as much as you can—get to know the Real before you read about the counterfeit. For more mature Christians, however, this is an important book to read.
(As a brief aside, in reading The Screwtape Letters this time through, I listened to the audiobook narrated by Joss Ackland and he delivered a phenomenal performance!)