Paul is sharing with the church of Corinth that God had revealed things to him that would be worth boasting. Please continue reading to see why he does not boast…..
“That experience is worth boasting about, but I’m not going to do it. I will boast only about my weaknesses. If I wanted to boast, I would be no fool in doing so, because I would be telling the truth. But I won’t do it, because I don’t want anyone to give me credit beyond what they can see in my life or hear in my message, even though I have received such wonderful revelations from God. So 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. Three different times I begged the Lord to take it away. 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. 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.”
2 Corinthians 12:5-10 NLT