I CAN SEE THAT

"A blind man knows he cannot see, and is glad to be led, though it be by a dog; but he that is blind in his understanding, which is the worst blindness of all, believes he sees as the best, and scorns a guide."

Samuel Butler

17th century British poet/satirist

Can you think of anything worse than believing you know what you really don't know?

NAH, NAH, NA, NAH, NAH; I CAN'T HEAR YOU

"There is much pleasure to be gained from useless knowledge."

Bertrand Russell

19th/20th century British logician and philosopher

Much of my career involved selling data to companies, including some whose management declined to even learn what that data was about.

I recall one in particular who said, " I don't need to know; we know all we need to know." 

To which I replied, "Yes I know."