2 Corinthians 13:3

3 since you are demanding proof that Christ is speaking through me. He is not weak in dealing with you, but is powerful among you.

Read 2 Corinthians 13:3 Using Other Translations

Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.
since you seek proof that Christ is speaking in me. He is not weak in dealing with you, but is powerful among you.
I will give you all the proof you want that Christ speaks through me. Christ is not weak when he deals with you; he is powerful among you.