Dr. Timothy Keller talks about his new book, his first ever devotional, based on the book of Proverbs. Keller, the now retired senior pastor of Redeemer Presbyterian in New York City, is one of the most powerful theological minds today. Some have called him a modern day C.S. Lewis. His book, God's Wisdom for Navigating Life," he co-wrote with wife Kathy. She joins him in the podcast...a rare interview with both Kellers together.