If you think you understand it, that only shows that you don't know the first thing about it.

Nothing exists until it is measured.

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

In the great drama of existence we are audience and actors at the same time.

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

Truth and clarity are complementary.

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