I reread the first five chapters of The Purpose-Driven Life, and all it managed to do is irritate me to no end. By Chapter Four, I was convinced that the confusion between law and gospel was so egregious as to make me have to quit highlighting the parts I didn't like because the whole book was a mess. This book is such a mess that no amount of "Lutheranize" a pastor might think he could do could even come close to saving this book. The proper thing to do would be scrap the thing and use God at Work: Your Christian Vocation in All of Life. Law and Gospel are rightly distinguished in that book.
For those who might have trouble with what I just said, I'll refer you to What Is This "Law & Gospel" Thing?
I made a couple of clarification edits. Big deal.