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

You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!

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

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.

[About describing atomic models in the language of classical physics:]

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

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

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.]

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.

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