Most Christians today lack knowledge of Church history.  John MacArthur explains that history is our guide when it comes to doctrines of the Church and also it reminds us of all the false teachings that have come from heretics.  Knowing your church history will guard you from falling into the same errors.  MacArthur is bold in calling out modern day false teachers such as Brian McClaren and Rob Bell.  He has a lot of quotes from the early church fathers on how they dealt with the heresies of their day.  This book will teach you about church history, church fathers, and how the Bible is sufficient for all matters of life and doctrine.