One can only presume that the relative unpopularity of St. John Henry Newman’s “Letter to the Duke of Norfolk” comes from its very name. A tract called “On Papal Infallibility and the Duty of Conscience,” written as it is by one of the greatest Christian writers of the past two centuries, would certainly gain notoriety, and serve as a better reflection of the contents. Whatever the title, it is a text which should be read at this moment. A Catholic publisher could do the…