For a Christian, it is faith that gives their life purpose. In his best-selling book The Purpose Driven(TM) Life: What on Earth Am I Here For?, Rick Warren says, "You must begin with God. You were born by his purpose and for his purpose."

But as a non-believer, your purpose resides in yourself; it is yours alone to discover and develop. It's about choosing to live your own life for your own reasons. No one can dictate your purpose. You decide.

This book...