This book makes the argument that humankind was placed here on earth to multiply, fill the world and take dominion over all of God's other creations. A purpose driven life will necessarily align with these purposes. A purpose driven life is one that is fulfilling God's purposes. How well we do this is the primary reason why some people have become very successful while others have failed. Our spiritual side reflects our God connections and for the Christian it begins when one is born again. While our purposes and the things that drive us may need adjustment after we are born again, they do not change significantly. They all have one common denominator and that is fulfilling our responsibilities as parents and doing that in obedience to God. With this in mind, it should not be difficult to answer the question "what on earth am I doing here?" What drives our lives? It is the need to provide for our children, for adulthood comes with the obligation to find a life partner and begin multiplying and this is universal.