In Luther on the Christian Life: Cross and Freedom (Crossway, 2015), theologian and church history professor Carl Trueman (who is Presbyterian, not Lutheran) provides an excellent treatment of the great 16th-century Reforming Augustinian monk – more than biography, it’s a careful and critical consideration of Luther’s teachings on the Christian life, from salvation by childlike faith to obedience to civil government to doing marriage and parenthood.
Trueman on Luther is excellent all around; he’s devoted decades of study to the man who launched the Reformation. But my favorite part of the book was the few pages on Luther’s marriage and on Luther and Katie (Katharina von Bora) as dedicated parents (he would read his catechism with his children every day, saying that he, though he was a brilliant Reformer and minister of the gospel, was as much a learner of doctrine as they were). The bit below is a delightful and exemplary snapshot not just of the marriage of Martin and Katie Luther, but of the blessing that she was to him. You have to admire the practicality and thoughtfulness she brought to their marriage! (Indeed, much like that brought by my own wonderfully practical wife, Laura.)
“His unexpected [because he was a monk] marriage to his Katie proved to be delightful, loving, and fruitful. Today, visitors to the Augustinian cloister in Wittenberg…will see that the door frame has a little stool built into it on each side. The door frame was a present from Katie to her husband, made at a time when she felt they were not spending enough time talking to each other. Thus, at the end of a busy day, Martin and Katie could sit on either side of the door and talk to each other. Inside and upstairs, there is a similar arrangement, presumably for when the Saxon weather made an outdoor tryst somewhat wet and cold. This in itself speaks eloquently of the love and the happiness that marriage brought to the life of the Reformer” (Kindle, chapter 8).