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

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

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

A person who wasn't outraged on first hearing about quantum theory didn't understand what had been said.

Sometimes the child in one behaves a certain way and the rest of oneself follows behind, slowly shaking its head.

When asked ... [about] an underlying quantum world, Bohr would answer, 'There is no quantum world. There is only an abstract quantum physical description. It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about Nature.'

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