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"Your theory is crazy, but it's not crazy enough to be true."
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"Every sentence I utter must be understood not as an affirmation, but as a question."
Affirmation

"Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it."
Change

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

"Your theory is crazy, but it's not crazy enough to be true."
Theory

"When it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images."
Poetry

"An expert is someone who knows some of the worst mistakes, which can be made, in a very narrow field."
Mistake

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

"The best weapon of a dictatorship is secrecy, but the best weapon of a democracy should be the weapon of openness."
Democracy

"No, no, you're not thinking; you're just being logical."
Being
