Charles Spurgeon Commentary Mark 1:30

"Now Simon`s wife`s mother lay sick of a fever; and straightway they tell him of her:" — Mark 1:30 (ASV)

But Simon's wife's mother lay sick of a fever, and anon they tell him of her.

There were at least four of Christ's followers in the house, yet the mother of the wife of one of them lay sick of a fever. Grace does not prevent suffering in the body; there will still be physical diseases even though in the soul there is spiritual health.