How does God use people to witness in unlikely circumstances? How did God use the exiles to introduce Himself to great kings and leaders of empires? What were the qualities of Daniel, Joseph, and Esther that made them powerful witnesses for God while under the rule of those who did not share their faith? Does God use active or passive witnesses? Should one's witness be a formal Bible study series or scattered over time? What can we learn from these examples about sharing our faith and doing evangelism? How might these lessons apply to difficult situations that Christians may find themselves in?