But those are preaching Christ in a spirit of competition, not from their hearts, but with the purpose of giving me pain in my prison.

Because to you it has been given in the cause of Christ not only to have faith in him, but to undergo pain on his account:

I have been paid in full and have more than enough. I am fully supplied, now that I have received from Epaphroditus what you sent a fragrant aroma, a sacrifice acceptable and pleasing to God.