2 Corinthians 8:11
“And now also you have completed the doing of it.”
He said not, you have done it, but, you have put a completion to it,
“That as there was the readiness to will, so also [there may be] the completion also out of your ability.”
That this good work halt not at readiness but receive also the reward that follows upon deeds.
Source: Homilies on Second Corinthians (New Advent)