Those that desire and choose to serve the Lord Jesus Christ  in ministry have to be on guard at all times to watch

15 Some, to be sure, are preaching Christ even from envy and strife, but some also from good will;

16 the latter do it out of love, knowing that I am appointed for the defense of the gospel;

17 the former proclaim Christ out of selfish ambition rather than from pure motives, thinking to cause me distress in my imprisonment