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

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.

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.

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

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

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

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

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. Anthropological Commentary The opposite of a trivial truth is false; the opposite of a great truth is also true.

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

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

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

Einstein, stop telling God what to do!

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.

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

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

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.

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

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

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

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