Some proclaim Christ from envy and rivalry, but others from goodwill.  These proclaim Christ out of love, knowing that I have been put here for the defense of the gospel; the others proclaim Christ out of selfish ambition, not sincerely but intending to increase my suffering in my imprisonment.  What does it matter?  Just this, that Christ is proclaimed in every way, whether out of false motives or true; and in that I rejoice.

Complete unity with all other Christians is not our goal, but rather the spread of Christ's gospel in every way.  We will sometimes suffer even at the hands of others who spread the word of Christ.  This should not anger, confuse or sadden us, we should rejoice that the Word is still being proclaimed.  Our consolation from all other Christians is not important or even possible in this fallen world.  Saint Paul's sufferings while in prison were increased significantly because of others spreading the same gospel message as he.  Sometimes these people deliberately sought to increase his suffering through their action.  But Paul had been brought to such a state that he was able to say, "What of it?  The proclamation of Christ is paramount."  He was truly full of love for Christ.

Christ himself taught us not to hinder those who proclaim him but are not in union with us.  John told him "Master, we saw someone casting out demons in your name, and we tried to stop him, because he does not follow with us."  But Jesus said to him, "Do not stop him; for whoever is not against you is for you." (Luke 9.49-50)  It is sometimes easy for Christians to become exclusive and intolerant, adopting a narrowly focused idea of how the Holy Spirit should operate among men to spread the Word.  We adopt our human notions and ideas on who has the Spirit and who does not.  In the end what matters is the spread of the gospel (and witness to it).  This takes the focus off us entirely.