Adam Clarke on 2 Corinthians 9:2

I know the forwardness of your mind - You have already firmly purposed to contribute to the support of the poor and suffering saints.

That Achaia was ready a year ago - The whole of the Morea was anciently called Achaia, the capital of which was Corinth. The apostle means, not only Corinth, but other Churches in different parts about Corinth; we know there was a Church at Cenchrea, one of the ports on the Corinthian Isthmus.

Your zeal hath provoked very many - Hearing that the Corinthians were so intent on the relief of the sufferers in Palestine, other Churches, and especially they of Macedonia, came forward the more promptly and liberally.