'In Sin' in the Bible

those preach the gospel of Christ, not in sincerity, but from a principle of contention, with a view to inflame the persecution against me:

the former are preaching Christ from the motive of rivalry, not in sincerity, supposing that this is making it harder for me to bear my imprisonment.

What difference then does it make? In one way or another, whether in pretense or in sincerity, Christ is being preached, and that is the thing that makes me glad; yes, more too, I will continue to be glad of it,