Introduction by Michael Matt: I’m happy to introduce my great-grandfather, Hugo Klapproth, and his “new” book, Letters to a Protestant Friend. Full disclosure: The book is new only to English-speaking readers living 130 years after it was published in German here in St. Paul, Minnesota. I hope to have the book available for sale here at The Remnant before Christmas 2022. Apart from a thoughtful historical piece, this little book also makes a masterful contribution to Catholic apologetics. As a convert from Lutheranism and a professional newspaper editor, Hugo Klapproth’s arguments to his Lutheran friend are some of the most…