Luke 14:11:

For whosoever exalteth himself shall be abased; and he that humbleth himself shall be exalted.

See also:

Objection: God Wouldn’t Heal Paul’s Thorn in the Flesh
Objection: Sickness, While Unpleasant, Is Used by God to Build Character
Objection: God Uses Sickness to “Break” Us
Objection: God Clearly SENT Plagues in the Old Testament.  We Cannot Say That God Never Makes People Sick, Because He Obviously Did.