I was around Dr. Albert Mohler as a student not too long after he lead a massive turnaround at The Southern Baptist Theological Seminary. What he accomplished and the stories I heard from his lips and the stories I've heard for many others ring in my ears on the days I need to remember that things can change, that God can change things, and that He calls us to lead change. Because of that, I want to recommend to you his book The Conviction to Lead. It's $4.99 for Kindle right now.