"A Handbook of Enemy Strategies" true spiritual warfare

I don't usually use other people's work, however I read this and was blown away by its simplicity, depth, and practicality. It's written by John Piper, one of my personal heroes who have encouraged me tremendously. This is especially for all those of you out there who have ever been interested in the concept of "Spiritual Warfare". THIS is TRUE spiritual warfare, and the way we fight it is through prayer, learning God's word (so that we will not sin against him), vigilance, zeal, and most importantly love.