2 Corinthians 12:7-10
“And by the exceeding greatness of the revelations, that I should not be exalted, there was given to me a thorn in the flesh, a messenger of Satan to torment me, that I should not be exalted. Concerning this thing, I begged the Lord three times that it might depart from me. He has said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Most gladly therefore I will rather glory in my weaknesses, that the power of Christ may rest on me. Therefore I take pleasure in weaknesses, in insults, in necessities, in persecutions, in distresses, for Christ's sake. For when I am weak, then I am strong.”
Paul is defending his apostleship against critics in Corinth. To counter any boasting about extraordinary spiritual experiences, he reveals a persistent, painful affliction he calls a "thorn in the flesh" and shares God's response to his pleas for its removal.
What does enduring a persistent difficulty, rather than having it removed, reveal about the nature of strength and dependence?