“You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.”

“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.”

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

“It is the hallmark of any deep truth that its negation is also a deep truth”

“Every great and deep difficulty bears in itself it’s own solution. It forces us to change our thinking in order to find it.”

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

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