There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true. - Niels Bohr
Prediction is very difficult, especially about the future. - Niels Bohr
Anyone who is not shocked by quantum theory has not understood it. - Niels Bohr
[About describing atomic models in the language of classical physics:]We must be clear that when it comes to atoms, language can be used only as in poetry. The poet, too, is not nearly so concerned with describing facts as with creating images and establishing mental connections. - Niels Bohr
It is not enough to be wrong, one must also be polite. - Niels Bohr
Perhaps I have found out a little about the structure of atoms. - Niels Bohr
Stop telling God what to do with his dice. - Niels Bohr
Every sentence I utter must be understood not as an affirmation but as a question.[A caution he gives his students, to be wary of dogmatism.] - Niels Bohr
Your theory is crazy, but it's not crazy enough to be true. - Niels Bohr
The meaning of life consists in the fact that it makes no sense to say that life has no meaning. - Niels Bohr
The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. - Niels Bohr
You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth. - Niels Bohr
Never express yourself more clearly than you are able to think. - Niels Bohr
Everything we call real is made of things that cannot be regarded as real. - Niels Bohr
An expert is a person who has made all the mistakes that can be made in a very narrow field. - Niels Bohr