Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems .
It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we say about Nature.
The opposite of every great idea is another great idea.
Address to Albert Einstein: You are not thinking. You are merely being logical.
You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!
When it comes to atoms, language can be used only as in poetry.
We are trapped by language to such a degree that every attempt to formulate insight is a play on words.
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.
Those who are not shocked when they first come across quantum theory cannot possibly have understood it.
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.
The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.
It is not enough to be wrong, one must also be polite.
Some subjects are so serious that one can only joke about them.
Physics is the belief that a simple and consistent description of nature is possible.
The measurement we get when we measure something is not a property of the thing measured.
No paradox, no progress.
In the great drama of existence we are audience and actors at the same time.
If you have a correct statement, then the opposite of a correct statement is of course an incorrect statement, a wrong statement. But when you have a deep truth, then the opposite of a deep truth may again be a deep truth.
A deep truth is a truth so deep that not only is it true but it’s exact opposite is also true.