I'm not saying this will work for everybody, but if somebody believes in God and the Bible, reading it can help provide meaning and direction. Both of these are very important to have when dealing with an issue like chronic pain. Feeling like there is a higher purpose or that you know what will come next can make the day-to-day easier.
For some, God or whatever deity they prefer to worship, may very well give them strength and purpose. That's only if they can focus simply on the tip on the iceberg. If they for whatever reason look at it into depth, and said being is all powerful, can do whatever, and has the ability to do as they please.... Then why? Why would you do it? I know.... People will say "Well he's not a miracle worker". If he's not, don't make him out to be.