content: To tell the truth I was a bit hesitant to purchase this book as loosing my "joy" was not something to which I was willing to admit.John Piper doesn't disappoint. His books are deep which is exactly what I needed as there are just too many superficial books on various Christian topics which tend to lack substance or depth or have any real effect in changing one's heart. John Piper tells it like it is and gets to the heart of the matter.I'm so glad I finally gave in and purchased this book. I have been blessed and I have been able to rediscovered the joy of the Lord that I had when I was first saved.If you can't handle the truth and are not wanting to actually put the time and struggle into what it takes to truly abide with God on a deeper level than this book is not for you. If you are a mature believer who needs a good kick in the pants than this is the book for you. Awesome book! If it is what you need then you will NOT be disappointed!