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

Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

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.

Accuracy and clarity of statement are mutually exclusive.

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.'

The measurement we get when we measure something is not a property of the thing measured.

No paradox, no progress.