Faith and Works

Someone (Piper? CS Lewis?) said that you should read three old books for every new book. Now, i clearly don't do that, but my dissertation will be about Biblical Doctrine in the Reformation (thats the plan anyway, my supervisor is concerned that i'm writing a theology essay, whereas i should be writing a history essay), but i've just found this by Luther, as an introduction to Romans. It's good stuff, go read! I'm looking forward to tucking into more as the weeks go by...