Thank you to Justin Taylor for pointing to this lecture by D.A. Carson.
Last year, D.A. Carson gave a lecture in California, How Could a Good God Allow Suffering. Dr. Carson has written several dozen books, including God Who Is There: Finding Your Place in God’s Story and How Long, O Lord? Reflections on Suffering and Evil. I recommend them both.
And I recommend this lecture embedded below. But if you only have five minutes, go to the 1 hour and 27 minute mark of the video to watch his answer to this question: I’ve been living with major physical pain and I know God can heal me and His will is for me to be healed. Why won’t he or why doesn’t He?