To keep me from becoming conceited because of these surpassingly great revelations, there was given me a thorn in my flesh, a messenger of Satan, to torment me. Three times I pleaded with the Lord to take it away from me. But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me. ~2 Corinthians 12:7-9
Paul states that he had an unnamed affliction that would not disappear, but he comes to understand that it's more to God's glory that he persists in his weakness.
If God only wants the best for us, then why doesn't He heal everyone? Jesus certainly seemed to heal everyone who demonstrated faith in the New Testament. Aren't we more faithful since we can't see Him and yet still believe?
God DOES want only the best for us, and we don't always know what that is exactly. You can't lean on your own understanding of good and bad. He wants for us to eventually be beyond a world that causes death, disease, pain, and infirmities, yes. However, He uses the bad that occurs in our corrupt world to bring out the good, either for ourselves or others.
Let's not forget Job who suffered from a skin disease (not to mention losing his entire family and all his possessions). In the most beautiful passage in the Bible, God explains everything and nothing when He responds to Job's moans. He told him and his faithful friends that Job certainly didn't suffer due to lacking faith.
Where were you when I laid the earth’s foundation? Tell me, if you understand. Who marked off its dimensions? Surely you know! ~Job 38:4-5
People, many times good people, suffer because of reasons unknown to us. We should trust that God is in control and He is good.
Your purpose here on Earth is bigger than living in comfort. It's to show others the Light and the joy of His Love. Sometimes, that comes from miraculous healing. Sometimes, that comes from a believer withstanding through hardship and serving as a guide to others who must suffer the same. Sometimes, the circumstances call for a bit of both.
You may see all the healing Jesus did during His ministry here, and see that He healed everyone who asked for healing and had faith He would. He was also here for a purpose bigger than living in comfort. Part of His mission was to show that He cares and loves us.
There's no possible way to list all the times God healed in the Bible from Old through New Testaments (or God was referred to as a healer or God was asked to heal) without just linking to the entire Bible. He is the ultimate Healer. However, He doesn't heal everyone all the time. With the exception of those faithless who reject His healing, why would He not heal His children?
Jesus healed everyone who had faith and pursued Him in the new Testament, but that can't be said to be true before nor after. He was here on Earth for the express purpose of proving that He was God (only God can heal, forgive, etc.) and to serve as a sacrifice for our sins to eliminate the forces of darkness for His disciples' souls. His healing had a dual purpose: Healing is symbolic of His spiritual healing and salvation. Notice this though: Jesus still died.
Then He began to teach them that the Son of Man must suffer many things and be rejected by the elders, chief priests, and scribes, and that He must be killed and after three days rise again. He spoke this message quite frankly, and Peter took Him aside and began to rebuke Him. But Jesus, turning and looking at His disciples, rebuked Peter and said, “Get behind Me, Satan! For you do not have in mind the things of God, but the things of men.” ~Mark 8:31-33
They say courage is not the absence of fear but rather the knowledge that there is something bigger than it. This is exemplified by Jesus.
Death, serious injury, and disease are products of an evil world. Notice that evil still exists, even for us believers. We still live in a fallen world, and God has not yet eliminated it all. Though we are Children of God, we must suffer a little while just as Jesus did.
Yet, this evil is not forever.
"He will wipe every tear from their eyes. There will be no more death’ or mourning or crying or pain, for the old order of things has passed away." ~ Revelations 21:4
God is bigger than anything you may ever face. Keep your eyes on Him and not the storm.
God bless!
~Dedicated to my mama who is facing great unknowns right now. Our Healer is in control, and your suffering is not without purpose.~
Sources other than Bible:
https://www.learnreligions.com/why-doesnt-god-heal-everyone-701958
https://www.ucg.org/bible-study-tools/bible-questions-and-answers/why-didnt-jesus-christ-heal-the-gentile-womans
https://www.ligonier.org/blog/why-jesus-heal/
https://www.biblestudytools.com/blogs/chris-russell/why-doesn-t-god-heal-every-sickness-disease-and-illness.html