In coming to faith in God, we are being made over into a new person, recreated into the image of Jesus. As Paul has encouraged them to through away the old life, there is one last piece of old clothing to throw away: the way we see each other. When we se each other with worldly labels and divisions, it causes us to divide oursleves and diminishes our own value. But when we set our eyes on things above, we see that Christ is all that matters. And when all of us together focus on Him, the things we see in each other that seperate us won't be out focus any more.