An expert is a man who has made all the mistakes which can be made, in a narrow field.
Oh, what idiots we all have been. This is just as it must be.
It is not enough to be wrong, one must also be polite.
Truth and clarity are complementary.
Some subjects are so serious that one can only joke about them.
Anyone who is not shocked by quantum theory has not understood it.
It is a great pity that human beings cannot find all of their satisfaction in scientific contemplativeness.
Every sentence I utter must be understood not as an affirmation, but as a question.
How wonderful that we have met with a paradox. Now we have some hope of making progress.
Every valuable human being must be a radical and a rebel, for what he must aim at is to make things better than they are.
There is no quantum world. There is only an abstract physical description. 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...
Physics is to be regarded not so much as the study of something a priori given, but rather as the development of methods of ordering and surveying human experience. In this respect our task must be to account for such experience in a manner independent of individual subjective judgement and therefor objective in the sense that it can be unambiguously communicated in ordinary human language.
Your theory is crazy, but it's not crazy enough to be true.
We are all agreed that your theory is crazy. The question that divides us is whether it is crazy enough to have a chance of being correct.
An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.