days than it would now. Thus the presence of heretical books in a man’s library was then counted as proof positive that he was heretical. Remembering this, the presence of this book in Zwingli’s library is significant. And what makes it more significant is the fact that Zwingli wrote his own notes on it in the pages of the book, showing that he studied it. And it doubtless began affecting his method of exegesis as he revealed it later by making the Bible its own interpreter. If the year 1509 was