Isaiah 53:5 "But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. "
Sickness and suffering is not sent from God to make us grow. If that were the case, we should all be praying for more sickness. If sickness and suffering were God's method of teaching us, then why are there Christians who never get sick? Is it that they have learned enough? No sickness is part of this im-perfect world we live in.
Why then is there sickness? Sickness comes for various reasons. We do not take care of our bodies. Lack of sleep. Eating in-correctly. Lack of exercise. Stress. Genetic heritage. An attack of the devil.
I purposely placed the devil at the end of the list. Simply because as Christians we blame the devil for so many things that he simply is not responsible for. He may have something to do with my overeating for instance, but because of the victory to be found in Jesus, I do not have to be subject to the devils control.
Sickness and suffering is part of living in this world. But we do not have to be subject to this world. We can "Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage." Galatians 5:1
God bless you richly.