Several years ago, there was a man going through great physical problems and one of his legs had to be amputated. That did not arrest the course of his disease, and he ultimately died because of it. Just a few days before the man’s death, a minister visited him in the hospital, and the patient said something that perfectly expresses what “rejoicing in suffering” means to a Christian: “I never would have chosen one of the trials that I’ve gone through, but I wouldn’t have missed any of them for the world!”
This man had an awareness that his suffering was something of value. He wouldn’t have missed it! He wouldn’t have chosen it either! That is rejoicing in suffering.
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green