If you have a correct statement, then the opposite of a correct statement is of course an incorrect statement, a wrong statement. But when you have a deep truth, then the opposite of a deep truth may again be a deep truth.

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

An independant reality in the ordinary physical sense can neither be ascribed to the phenomenon nor to the agencies of observation.

Prediction is difficult, especially the future.

Every valuable human being must be a radical and a rebel, for what he must aim at is to make things better than they are.

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.

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