An expert is a person who has made all the mistakes that can be made in a very narrow field.
Prediction is very difficult, especially about the future.
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.
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.
Einstein, stop telling God what to do!
How wonderful that we have met with a paradox. Now we have some hope of making progress.
Your theory is crazy, but it’s not crazy enough to be true.
No, no, you’re not thinking; you’re just being logical.
Every sentence I utter must be understood not as an affirmation, but as a question.