“Un experto es una persona que ha cometido todos los errores que se pueden cometer en un determinado campo. ”

“There are some things so serious that you have to laugh at them.”

“Never express yourself more clearly than you are able to think”

“There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.”

“Prediction is very difficult, especially about the future.”

“An expert is a person who has made all the mistakes that can be made in a very narrow field.”

“The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.”