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.

Physics is the belief that a simple and consistent description of nature is possible.

One must always do what one really cannot.

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.

If you aren't confused by quantum mechanics, you haven't really understood it.

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

A physicist visits a colleague and notices a horseshoe hanging on the wall above the entrance. 'Do you really believe that a horseshoe brings luck?' he asks. 'No,' replies the colleague, 'but I've been told that it works even if you don't believe in it.'