Boon Xai Lor preached out in the book of Jonah. Jonah was a prophet that disobey God's calling in preaching to the city of Nineveh. Jonah disobey God by running away. Unlike Jonah, Boon Xai Lor encourages the church to be obedient to God's calling. God wants His church to go and be the light into the world.
The Apostle Paul reminds the church of Rome about their calling. They are called to be a minister of the Gospel to the Gentiles. Christians need the same reminder when following God. We are called to be representatives of the Gospel to those who do not know God.