I highly recommend the autobiography of Darlene Deibler Rose as an excellent example of persevering faithfulness in severe tribulation. Mrs. Deibler was a missionary's wife and as missionary life often goes it was filled with great suffering. But her life saw more. While in the missionary field she was caught in a war and became prisoner of the Japanese enduring great afflictions by the gracious and merciful hand of God. She understood fully how to live faithfully surrendered to God and He provided for her again and again. I was greatly challenged by her life. God used her story to cause me to reevaluate my own. Would I be willing to suffer as she did? I realized it wasn't a choice but rather a calling.
Also, the story of Corrie Ten Boom's life, "The Hiding Place" is remarkable and challenging in the very same way. "Faithful until the end, Corrie publicly forgave her German tormentor realizing that all men are not good but can be forgiven."
Praise God for giving us these fine examples to follow. We owe Him gratitude for His mercy in preserving these stories for us who live in a world were such fortitude is rarely seen.