In His last hours, Jesus prayed for unity of believers and said such unity would be a powerful witness to the world that God had sent Him. Often we speak of such unity in terms of having the same beliefs and practices as set forth in scripture. Although these are a must, Paul wrote of unity which was based on spiritual truths but expressed in another way - through humility with self-effacing concern for others. If we don't treat all of our brothers and sisters right, it doesn't matter if we have everything else right.