Which is the best man to deal with—he who knows nothing about a subject, and, what is extremely rare, knows that he knows nothing, or he who really knows something about it, but thinks that he knows all?

哪种人更值得交往：对一件事一无所知，却难能可贵地知道自己无知的人，还是确实知道一点，却自以为无所不知的人？