Paul says it is superfluous to write to them about the ministry to the saints, for he knows their readiness and has boasted of them to the Macedonians that Achaia has been ready since last year, and their zeal has stirred up most of them. But he is sending the brothers so that their boasting may not prove empty and that they will be ready, lest if the Macedonians come with him and find them unprepared, they and Paul be humiliated. So he sends the brothers to arrange in advance the gift they had promised, ready as a willing gift and not as an exaction.
Paul teaches a principle: whoever sows sparingly will reap sparingly, and whoever sows bountifully will reap bountifully. Each should give as he has decided in his heart, not reluctantly or under compulsion, for God loves a cheerful giver. God is able to make all grace abound to them, so that having all sufficiency in all things at all times, they may abound in every good work. As it is written, he has distributed freely, he has given to the poor, his righteousness endures forever.
He who supplies seed to the sower and bread for food will supply and multiply their seed and increase the harvest of their righteousness. They will be enriched in every way for all generosity, which through Paul produces thanksgiving to God. For the ministry of this gift not only supplies the needs of the saints but also overflows in many thanksgivings to God.
Because of the evidence of this service, they will glorify God for the Corinthians' submission to the confession of the gospel of Christ and for their generosity in sharing. They also pray for them with deep affection because of the surpassing grace of God in them. Paul closes the chapter with thanksgiving: thanks be to God for his inexpressible gift.