Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.
Every sentence I utter must be understood not as an affirmation, but as a question.
It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we say about nature.
Truth and clarity are complementary.
No paradox, no progress.
If an idea does not appear bizarre, there is no hope for it.