In the fifteenth chapter of the third Gospel, St. Luke gives us three linked parables of Jesus with a single, common theme: all three parables are about four lost things—a lost sheep, a lost coin, and two lost sons. Bible scholars sometimes call Luke Chapter 15 The Gospel Within the Gospel. I love that way of thinking about it. The Gospel Within the Gospel. Luke Chapter 15 is the terse précis of the entire Bible, the concise abstract to the sprawling dissertation the Bible finally turns out to be. If you are lost, says the en­tire Bible, God wants to find you.