Can you show me in scriptures where it is not God's will to heal?
Because of the surpassing greatness of the revelations, for this reason, to keep me from exalting myself, there was given me a thorn in the flesh, a messenger of Satan to torment me—to keep me from exalting myself! Concerning this I implored the Lord three times that it might leave me. 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, so 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 [II Corinthians 12:7-10].
Relevant points:
1. This-- whatever it was specifically-- was physical; "in the flesh."
2. It was "of Satan."
3. Even though it was of Satan, God refused to take it away.
4. While God will ultimately destroy Satan and his works, He still uses them to keep a person from exalting himself.
5. For Paul, it was "3 strikes and the idea was out." He didn't continue to chase physical deliverance when God had said no. Instead, he became "content" to face all kinds of problems because Christ is stronger where he (Paul) is weaker.
Now, was Paul wrong to take this attitude of accepting his distresses, physical and otherwise, or did he go into some deep depression about how faithless he must be since he was not healed?