weak vs strong

This is Paul speaking here...

2 Corinthians 12 

7 To keep me from becoming proud, 

I was given a thorn in my flesh, 

a messenger from Satan to torment me 

and keep me from becoming proud.

8 Three different times I begged the Lord to take it away. 

9 Each time he said, 

“My grace is all you need. 

My power works best in weakness.” 

So now I am glad to boast about my weaknesses, 

so that the power of Christ can work through me. 

10 That’s why I take pleasure in my weaknesses, 

and in the insults, 

hardships, 

persecutions, 

and troubles that I suffer for Christ. 

For when I am weak, 

then I am strong.