The History of the Reformation: How Christ Restored the Gospel to His Church
(This reads like a narrative and might be good to read to the kids)
Martin Luther: Lessons from His Life and Labor (sermon by John Piper)
I love this short description about Luther's choice to become a monk... God is the God of restoration and reformation! and our mistakes and bad choices are not beyond His sovereignty or out of reach of His providence...
In 1502 at the age of 19 he [Luther] received his Bachelors degree, ranking, impressively, 30th of 57 in his class. In January, 1505 he received his Master of Arts at Erfurt and ranked second among 17 candidates. That summer the providential Damascus-like experience happened. On July 2, on the way home from law school, he was caught in a thunderstorm and hurled to the ground by lightening. He cried out, "Help me, St. Anne; I will become a monk." He feared for his soul and did not know how to find safety in the gospel. So he took the next best thing, the monastery.
Fifteen days later, to his father's dismay, he kept his vow. On July 17, 1505 he knocked at the gate of the Augustinian Hermits in Erfurt and asked the prior to accept him into the order. Later he said this choice was a flagrant sin--"not worth a farthing" because it was made against his father and out of fear. Then he added, "But how much good the merciful Lord has allowed to come of it!" We see this kind of merciful providence over and over again in the history of the church, and it should protect us from the paralyzing effects of bad decisions in our past. God is not hindered in his sovereign designs from leading us, as he did Luther, out of blunders into fruitful lives of joy.