This is how Jesus began his ministry:
… Jesus came to Galilee proclaiming the gospel of God:
“This is the time of fulfillment.
The kingdom of God is at hand.
Repent, and believe in the gospel.” (Mark 1:14-15)
Repent and believe in the gospel. This is what Jesus is calling us to do. In the first reading, God sent Jonah to make a final attempt to save the great city of Nineveh by calling the Ninevites to repentance or to suffer total destruction. The Ninevites repented and were spared. John the Baptist called for repentance. God wants us to repent.