Niels Bohr

Your theory is crazy, but it's not crazy enough to be true.

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.

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.

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

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

It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what we say about Nature.

An expert is someone who knows some of the worst mistakes which can be made in a very narrow field.

A physicist is just an atom's way of looking at itself.

Every sentence I utter must be understood not as an affirmation but as a question.

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.

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

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

An expert is a man who has made all the mistakes which can be made in a narrow field.

Einstein stop telling God what to do!

Prediction is very difficult especially if it's about the future.

If quantum mechanics hasn't profoundly shocked you you haven't understood it yet.

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

There are trivial truths and the great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.

The best weapon of a dictatorship is secrecy but the best weapon of a democracy should be the weapon of openness.

If anybody says he can think about quantum physics without getting giddy that only shows he has not understood the first thing about them.

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