2 Corinthians 10:10

10:10 because some say, “His letters are weighty and forceful, but his physical presence is weak and his speech is of no account.”

2 Corinthians 12:10

12:10 Therefore I am content with weaknesses, with insults, with troubles, with persecutions and difficulties for the sake of Christ, for whenever I am weak, then I am strong.

2 Corinthians 13:3

13:3 since you are demanding proof that Christ is speaking through me. He is not weak toward you but is powerful among you.

2 Corinthians 13:9

13:9 For we rejoice whenever we are weak, but you are strong. And we pray for this: that you may become fully qualified.