In Philippians chapter 2 Paul knew what some church workers today do not know, that there is a difference between unity and uniformity. True spiritual unity comes from within; it is a matter of the heart. Uniformity is the result of pressure from without.
There can be no joy in the life of the Christian who puts himself above others. The humble person is not one who thinks less of himself; he simply does not think of himself at all! The beauty of this passage is that it asks us if we have the mind of Christ and if we do then we need to put it on display towards those that we disagree with as we practice renunciation and humiliation instead of insisting upon exaltation.
That is the “mind of Christ” and this mind of Christ will make it impossible for people to rob you of your joy because people can’t steal what you have willingly given away and no longer have! If you had a Lamborghini and you gave it away, and someone comes over and tells you your car was stolen, you can smile and say, “You’re mistaken, I gave that car away, it can’t be stolen.” We don’t have to fight with someone when we have willingly given our rights away!