"If an idea does not appear bizarre, there is no hope for it."

"Every sentence I utter must be understood not as an affirmation, but as a question."

"The progress of science depends on the freedom of thought."

"It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about nature."

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