In Acts chapter 18, Pastor Rich Whitter shares a powerful message titled "Understand the Mission." He uses his sermon to emphasize our call as Christians to serve God's mission and spread his Word. He urges us to understand the texts in scripture, to be humble and obedient servants of Jesus Christ, and to share our faith with others. He reminds us that we are called by God to make disciples of all nations, which includes both the spiritual and the physical. He encourages us to be willing to give up our personal comfort in order to carry out God's mission faithfully.