By Arron Chambers Christian leaders, some of them preachers themselves, tell us about a sermon they can”t forget””and maybe you won”t either. TRACEY D. LAWRENCE Tracey D. Lawrence is an author and professor. She has written for Chuck Colson”s BreakPoint, the Wilberforce Forum, Promise Keepers, Sheila Walsh, Rebecca St. James, and others. She holds a BS in Christian education and an MA in church history and theology. Her book written with Eric Irivuzumugabe, My Father, Maker of the Trees, a memoir of the Rwandan genocide, was featured on The New York Times best-seller list. Tracey serves as a professor