A man's spirit will endure sickness, but a crushed spirit who can bear?
Proverbs 18:14 ESV

There are different kinds of sickness: physical, mental, and spiritual.

A healthy spirit helps to ward off all kinds of sickness and gets you through bad times. A sick spirit makes every little injury feel mortal. If you are spiritually strong, you can bear up against anything, but if you are spiritually weak, you don't even need an enemy to bring you down.

And sickness and injury are light afflictions compared to betrayal and cruelty.