read Hebrews 11, as God commended at first those whose faith in him asaw great and mighty acts he did for them, but then:
release, so that they might rise again to a better life. 36 Others suffered mocking and flogging, and even pchains and imprisonment. 37 qThey were stoned, they were sawn in two,1 rthey were killed with the sword. sThey went about in skins of sheep and goats, destitute, afflicted, mistreated—38 of whom the world was not worthy—twandering about in deserts and mountains, and in dens and caves of the earth.
39 And all these, uthough commended through their faith, udid not receive what was promised, 40 since God had provided something better for us, vthat apart from us they should not be made perfect
Also, peter referring to isaiah 53 said:
Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed.
1Pe 2:25 For ye were as sheep going astray; but are now returned unto the Shepherd and Bishop of your souls.
So the death of jesus for spiritually, not physical healing!
So its the Sovereign Will of God, sometimes he chooses to do healings, many times chooses not too also!