- 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.
- If anybody says he can think about quantum problems without getting giddy, that only show he has not understood the first thing about them.
- An expert is a person who has made all the mistakes that can be made in a very narrow field.
- Never express yourself more clearly than you are able to think.
- The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
- [spoken to a young physicist] We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough. [often paraphrased as: "Your theory is crazy, but it's not crazy enough to be true."]
- No, no, you're not thinking; you're just being logical.
- There are some things so serious you have to laugh at them.
- How wonderful that we have met with a paradox. Now we have some hope of making progress.
- If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
- Every sentence I utter must be understood not as an affirmation, but as a question.
- Prediction is very difficult, especially about the future.
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