2 Corinthians 9:3

9:3 But I am sending these brothers so that our boasting about you may not be empty in this case, so that you may be ready just as I kept telling them.

2 Corinthians 12:7

12:7 even because of the extraordinary character of the revelations. Therefore, so that I would not become arrogant, a thorn in the flesh was given to me, a messenger of Satan to trouble me – so that I would not become arrogant.

2 Corinthians 12:9

12:9 But he said to me, “My grace is enough for you, for my power is made perfect in weakness.” So then, I will boast most gladly about my weaknesses, so that the power of Christ may reside in me.