I am reading "The Presence of the Kingdom" by Jacques Ellul. I just finished the first chapter and it is the best chapter I have read of any book in decades. If you seek the reign of god here and now, this is the book for you. If you are in love with religion or the world, you shouldn't waste your time you would not understand it in the first place. You can check out some of Ellul's thoughts (in pdf) at Free Jacques at JesusManifesto.