The religious leaders of Jesus' day knew Isaiah 42 and Isaiah 49 like the back of their hands. God had inspired the prophet to write about His Messiah as the "Light of the World." So when they heard Jesus say, "I AM the Light of the World," they understood exactly what He was claiming. He was the Messiah. It shook their world with an earthquake of resentment and anger. But it is good news for every believer!