When our Lord was on earth He healed great numbers of sick and diseased people. The believers at Pentecost also healed many in the name of Jesus, offering to Israel His return from heaven upon condition of their repentance (Acts 3:19-21).
All those who were healed, however, finally succumbed to physical infirmity or disease again and died after all. This was because the Lord Jesus was rejected as King, not only in His incarnation but also in His resurrection. Rom. 8:22,23 declares the result as we see it in our own day:
“…we know that the whole creation groaneth and travaileth in pain together until now. And not only they, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves, waiting for the adoption, to wit [that is], the redemption of our body.”
But Christians in “this present evil age” often need physical infirmity to draw them closer to God in prayer and faith. Paul himself said:
“…there was given to me a thorn in the flesh… lest I should be exalted above measure. For this thing I besought the Lord thrice, that it might depart from me. And He said unto me: My grace is sufficient for thee, for My strength is made perfect in weakness” (II Cor. 12:7-9).
The Apostle’s response to this shows how well he understood that suffering and weakness are an important part of Christian discipline.
“Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me… I take pleasure in infirmities… for when I am weak, then am I strong” (II Cor. 12:9,10).
“For which cause we faint not; but though our outward man perish, yet the inward man is renewed day by day. For our light affliction, which is but for a moment, worketh for us a for more exceeding and eternal weight of glory” (II Cor. 4:16,17). source