Matthew Henry Commentary 2 Corinthians 8:1-6

"Moreover, brethren, we make known to you the grace of God which hath been given in the churches of Macedonia; how that in much proof of affliction the abundance of their joy and their deep poverty abounded unto the riches of their liberality. For according to their power, I bear witness, yea and beyond their power, [they gave] of their own accord, beseeching us with much entreaty in regard of this grace and the fellowship in the ministering to the saints: and [this], not as we had hoped, but first they gave their own selves to the Lord, and to us through the will of God. Insomuch that we exhorted Titus, that as he made a beginning before, so he would also complete in you this grace also." — 2 Corinthians 8:1-6 (ASV)

The grace of God must be acknowledged as the root and fountain of all the good in us, or done by us, at any time. It is great grace and favor from God if we are made useful to others and eager for any good work. He commends the charity of the Macedonians.

So far from Paul needing to urge them, they pleaded with him to receive the gift. Whatever we use or spend for God, it is only giving Him what is His own. All we give for charitable purposes will not be accepted by God, nor will it benefit us, unless we first give ourselves to the Lord.

By ascribing all truly good works to the grace of God, we not only give the glory to Him to whom it is due, but also show people where their strength lies. Abundant spiritual joy enlarges people's hearts in the work and labor of love. How different this is from the conduct of those who will not join in any good work unless they are urged into it!