Prediction is very difficult, especially about the future. - Niels Bohr

"How wonderful that we have met with a paradox. Now we have some hope of making progress."

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

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

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