by Timothy Keller The Prodigal God is Tim Keller’s work on Luke 15, the parable of the Prodigal Son. Or as he prefers, the Prodigal God, referring to the fact that God is so prodigal, so “reckless” with his grace. Keller is always insightful and a clear writer. Though he deals with the entire chapter, and especially with 15:11-30, the lost sons, his primary attention is given to the elder brother in 15:25-30. A brief but stimulating book on perhaps the greatest chapter in the Bible.