Niels Bohr

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

It is not enough to be wrong, one must also be polite.

I myself find the division of the world into an objective and a subjective side much too arbitrary. The fact that religions through the ages have spoken in images, parables, and paradoxes means simply that there are no other ways of grasping the reality to which they refer. But that does not mean that it is not a genuine reality. And splitting this reality into an objective and a. subjective side won't get us very far.

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

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.

Prediction is very difficult, especially about the future.

You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

Stop telling God what to do with his dice.

The very nature of the quantum theory ... forces us to regard the space-time coordination and the claim of causality, the union of which characterizes the classical theories, as complementary but exclusive features of the description, symbolizing the idealization of observation and description, respectively.

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

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 if it's about the future.

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.

Technology has advanced more in the last thirty years than in the previous two thousand. The exponential increase in advancement will only continue.

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

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

While the finish given to our picture of the world by the theory of relativity has already been absorbed into the general scientific consciousness, this has scarcely occurred to the same extent with those aspects of the general problem of knowledge which have been elucidated by the quantum theory.

Einstein, stop telling God what to do!