Like many people, I assumed the word prodigal meant "wayward or wasteful." So when Timothy Keller's book first hit the book shelves, I remember looking at the front cover, noticing the "NY Times Bestseller" sticker on the label and thinking to myself, "Bah, this must be another self-help 'spiritual' book about a god who wants to be in a relationship with man in order to bless him but needs some help finding his way." But after noticing this book under the arms of men whose faith I admire and seeing it distributed with the Angel Tree gifts our church sent out last Christmas, giving the book further investigation seemed like a wise choice.
Keller's book starts out by clarifying the definition of prodigal—1) recklessly extravagant, and 2) having spent everything—which gives understanding for the book's title, The Prodigal God. He then puts the story in context with the rest of the chapter of Luke, noting that this parable is Jesus’ response to the grumbling Pharisees and scribes around him and that Christ starts the story by saying, "There was a man who had two sons." By the end of the first chapter, I realized that Timothy Keller's careful handling of Biblical exegesis would not allow this book to just be another dry re-hashing of a wayward son who wound up gnawing on pig feed because of his disobedience to God, and the reader can come away with more than just the knowledge that God is rich in mercy and grace no matter what we've done.
Keller goes on to lay a solid foundation to the story by drawing attention to the fact that the older brother does not enter into the feast at the end of the parable. So what we have is two lost sons; the moralistic older brother who follows all the rules, trying to merit his father's good graces, as well as the wayward and reckless younger brother. These are two personalities everybody can identify with; and apart from walking in God's grace, these two brothers represent the way in which man alienates himself from God.
Our society is divided into two cultures, as Keller points out. The culture of the "older brother" is the conventional moral conformist, commonly known for "stability" as well as striving to please authority figures. The "younger brother" culture lives by their own rules, walking a path of self-discovery. Every person gravitates to one of these two categories, and some combine the two. Both cultures proclaim, "If those people would follow our example, the world would be a better place." Our problem is that, no matter what side of the cultural divide we land on, we still play the role of the two lost sons, alienating ourselves from the Father by a self-centered focus on either keeping all the rules or breaking them all.
Within every person's heart is a hunger for home. The Prodigal God seeks to show us there is no satisfaction in our own efforts and pursuits to fill that longing with the things of this world since they are only here to serve as signs and reminders pointing to the feast—Christ's saving work. If you want a deeper understanding of how we live next to the feast without entering or wander far from it, and if you want a better idea of what this feast looks like, then I recommend reading this book.