Niels Bohr

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.

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.

There are some things so serious that you have to laugh at them.

How wonderful that we have met with a paradox. Now we have some hope of making progress.

No, no, you're not thinking; you're just being logical.

Those who are not shocked when they first come across quantum theory cannot possibly have understood it.

Everything we call real is made of things that cannot be regarded as real.

Never express yourself more clearly than you are able to think.

Stop telling God what to do with his dice.

Every great and deep difficulty bears in itself it’s own solution. It forces us to change our thinking in order to find it.

The meaning of life consists in the fact that it makes no sense to say that life has no meaning.