Not all mysteries are fun. Sometimes the unknown causes fear and anxiety. Or it can cause some to avoid thinking about it or even to reject it. That’s how some respond to the mystery of God’s mercy. Some are apathetic about it. Some say they don’t see God’s mercy at work in the world today. Some feel they don’t need it.
When Paul uses the word “mystery,” he doesn’t mean it like the novels, movies or games mean it. It’s not something we can put on our Sherlock Holmes hats and deduce on our own. He means a divine truth previously hidden that can only be known by God’s revelation. God revealed the mystery of His mercy to Paul and in chapter 11 of Paul’s letter to the Romans, he wanted believers to understand the mystery of God’s mercy towards all people, both Jew and Gentile alike. We can understand the mystery of God’s mercy.