I am ashamed to say that we were [too] weak to do such things. [Note: Paul is probably saying, sarcastically, "We are too 'weak' to take financial advantage of people and mistreat them the way those 'super apostles' there in Corinth were doing"]. Yet, in whatever [matters] anyone [there] dares to boast about, (now I am really speaking foolishly), I will dare to boast also.