Paul says:

"If I have to boast, I will boast of what pertains to my weakness"

"And He has said to me, "My grace is sufficient for you, for power is perfected in weakness." Most gladly, therefore, I will rather boast about my weaknesses, that the power of Christ may dwell in me. Therefore I am well content with weaknesses, with insults, with distresses, with persecutions, with difficulties, for Christ?s sake; for when I am weak, then I am strong."

" For Christ did not send me to baptize, but to preach the gospel, not in cleverness of speech, that the cross of Christ should not be made void."

(The following is one of my favorites, bold print added)

"but God has chosen the foolish things of the world to shame the wise, and God has chosen the weak things of the world to shame the things which are strong, and the base things of the world and the despised, God has chosen, the things that are not, that He might nullify the things that are, that no man should boast before God. But by His doing you are in Christ Jesus, who became to us wisdom from God, and righteousness and sanctification, and redemption, that, just as it is written, "Let him who boasts, boast in the Lord."

"But may it never be that I should boast, except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world."

"But whatever things were gain to me, those things I have counted as loss for the sake of Christ. More than that, I count all things to be loss in view of the surpassing value of knowing Christ Jesus my Lord, for whom I have suffered the loss of all things, and count them but rubbish in order that I may gain Christ,"

(from Life in Jesus)