Well, sort of a commentary.
The subtitle for this book is descriptive enough: “Sermon Notes on the Book of Romans.” A few years ago, I preached a series of 65 sermons through this magisterial book, and some time after that I put them all together in a big file and went through it all with some heavy grit sandpaper. The end result is something of a cross between a commentary and a series of practical devotions and/or exhortations. In hard copy, it comes in over 300 papers, but you can get it here, where it weighs virtually nothing. For a dollar.
Full disclosure. Just know, going in, that it is not Karl Barth.