2 Corinthians 9:14

While they themselves also, with supplication on your behalf, long after you by reason of the exceeding grace of God in you.

Paul here continued to elaborate the spiritual benefits that would come from the contribution at Corinth. The recipients would remember them with thanksgiving in their prayers, "supplications on your behalf."

Long after you ... The reputation and honor of the Corinthians would be enhanced and magnified.

The exceeding grace of God in you ... shows that Paul was projecting a very liberal and bountiful contribution and that he was not looking for a merely token response to his appeal. In regard to the question of how much money they might have given, Carver has this:

The apostle's appeal proved successful, for a few months later he wrote from Corinth to the Romans that "Macedonia and Achaia have been pleased to make a contribution for the poor among the saints in Jerusalem" (Romans 15:26 NASB).[22]