Ed Mathews uses John 9.3 and the story of the blind man as a wonderful explanation of evil in the world. Here's how he starts:
While in Jerusalem, Jesus saw a blind man, John 9:1. As a visitor in the capital city, one might assume the Lord would be enamored with the beautiful buildings. His disciples were, Matthew 24:1. But Jesus was not a tourist. He came to rescue the perishing.
Focus question: Does the pain and suffering in the world make me question God or glorify him?