Many Christians have been to Calvary, but not the Upper Room. They have knelt at the cross, but have not climbed the stairs to the top floor of that special room. They have experienced the power of the blood of Jesus, but not the power of Pentecost. Make no mistake about it, Jesus pushed His disciples to the Upper Room. He refused to let them linger at the cross and the empty tomb. He required more. He commanded them to go to Jerusalem and wait until...