From the link provided:"One such misinterpreter of Luther was Father O’Hare. Indeed, Luther’s statement “sin boldly” recieves plenty of attention in his book, The Facts About Luther. Here is an excellent example of violating exactly what Montgomery sets out above. The “sin boldly” quote is an obscure saying of Luther’s from a fragment of a letter. The letter has no address, salutation, or signature. In other words, it has no beginning or ending, thus lacking a complete context. I strongly doubt anyone besides Melanchthon was aware of this remark until many years (if not a hundred or two or three) after Luther’s death. The letter was originally part of a private collection that was published, I believe in the 1800’s. After being published, Catholic scholars (and some liberal protestant scholars) with a strong bent against Luther jumped all over it. Because Roman Catholic authors cited it out of context and blew it out proportion, common laymen (both Protestant and Catholic) were given a faulty understanding of Luther’s theology of justification by faith alone. Thus, I blame anti-Luther writings (pre-Joseph Lortz) for causing the confusion over this quote."If you’re going to disparage someone, at least be accurate in your disparagement.