In this sermon from Acts 16:11-15, Joshua Watkins focuses is on the example of Lydia, a woman whose life was transformed by her faith. Joshua emphasizes that evangelism is not just about spreading the gospel through words but also through our actions and lifestyle. Lydia's open heart to God's message, her hospitality, and her transformed life that influenced others are highlighted as key aspects of living an evangelistic life. The sermon concludes with a call to action for the congregation to give of themselves in service to others, reflecting God's love through their daily lives.