Albert Barnes Commentary 2 Corinthians 9:13

"seeing that through the proving [of you] by this ministration they glorify God for the obedience of your confession unto the gospel of Christ, and for the liberality of [your] contribution unto them and unto all;" — 2 Corinthians 9:13 (ASV)

While by the experiment, etc. Or rather, by the experience of this ministry; the proof (dokimhv), the evidence here provided by your liberality. In this ministry, they will have experience or proof of your Christian principle.

They glorify God . They will praise God as the source of your liberality, as the one who has given you the means to be liberal and has inclined your hearts to it.

For your professed subjection, etc. Literally, "For the obedience of your profession of the gospel." It does not imply merely that there was a profession of religion, but that there was a real subjection to the gospel which they professed. This is not clearly expressed in our translation. Tindal has expressed it better, "Which praise God for your obedience in acknowledging the gospel of Christ." There was a real and sincere submission to the gospel of Christ, and that was manifested by their giving liberally to supply the wants of others. The doctrine is, that one evidence of true subjection to the gospel, one proof that our profession is sincere and genuine, is a willingness to contribute to relieve the wants of the poor and afflicted friends of the Redeemer.

And unto all men. That is, all others whom you may have the opportunity to relieve.