This book explains and teaches why discipleship is so very important. Just as you would not bring a newborn baby home, show them where their supplies are kept (milk in the fridge, diapers on the changing table, crib in the nursery, etc.) it should not be the same treatment for new believers or even those who have not experienced the fullness of God's word. As you advance in your years as a Christian, you should be eating solid food, no longer existing on milk (the simple things).