""I am praying not only for these disciples but also for all who will ever believe in me through their message. I pray that they will all be one, just as you and I are one--as you are in me, Father, and I am in you. And may they be in us so that the world will believe you sent me"" (John 17:20-21, NLT). For most Christians these words of Jesus seem like an unreachable ideal. Or they promise spiritual unity without a visible demonstration between real...