Albert Barnes Commentary 2 Corinthians 9:12

"For the ministration of this service not only filleth up the measure of the wants of the saints, but aboundeth also through many thanksgivings unto God;" — 2 Corinthians 9:12 (ASV)

For the administration of this service. This refers to the distribution of this proof of your liberality. The word service here, says Doddridge, suggests that this was to be regarded not merely as an act of humanity, but religion.

The want of the saints. This refers to the needs of the poor Christians in Judea, on whose behalf it was contributed.

But is abundant also by many thanksgivings unto God. This means it will abound to God by producing thanksgivings. The result will be that it will produce abundant thanksgiving to God in their hearts.