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

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

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

“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.”

“Everything we call real is made of things that cannot be regarded as real.”

“It is not enough to be wrong, one must also be polite.”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”