And anyone who thinks they can talk about quantum theory without feeling dizzy hasn't yet understood the first thing about it.

When it comes to atoms, language can be used only as in poetry.

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

When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it.

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

In physics we deal with states of affairs much simpler than those of psychology and yet we again and again learn that our task is not to investigate the essence of things-we do not at all know what this would mean&mash;but to develop those concepts that allow us to speak with each other about the events of nature in a fruitful manner.

The old saying of the two kinds of truth. To the one kind belongs statements so simple and clear that the opposite assertion obviously could not be defended. The other kind, the so-called 'deep truths', are statements in which the opposite also contains deep truth.