When, as some say, every good thing is either a sin or fattening, it is all the more gratifying to find something that is bliss, cheap, and not a sin. No wonder most people are content to be, in fact are proud to be, ignorant. Dr. Johnson was right, and Cicero and Aristotle were wrong. But I have not yet even touched on what may be the highest praise that ignorance deserves. Some, including St. Paul, hold that ignorance is a sign of something very deep and very important in human nature, something we ought to cultivate instead of eradicate.
Consequent ignorance is the ignorance which remains after all our efforts to achieve knowledge.
For instance, I am personally ignorant of the date of the Battle of Lepanto, but I could find it out by asking you. You remember the date of the battle, but forget the name of the admiral who fought it, though you could find it out by asking me. Second, there is the ignorance of the undiscovered. These are matters which no one knows. There is no intrinsic reason why answers to these and like questions cannot become known.