A man‘s ignorance sometimes is not only useful, but beautiful, while his knowledge, so called, is oftentimes worse than useless, besides being ugly. 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?

Henry David Thoreau

• Found: Dictionary.com
• Henry David Thoreau (1817–`862), Wikipedia