I have to thank Jonathan Brink and his blog for directing me to the following 2 talks of Reggie McNeal who does an outstanding job describing what being missional is all about. To sum it up with one of Reggie's memorable statements: We need to stop looking at the kingdom through our church lense and begin looking at the church through the kingdom lense! The clips can be found here and here. (Tip: If the clips don't start playing right away, try refreshing your browser page!)
