If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.
Anyone who can contemplate quantum mechanics without getting dizzy hasn't understood it.
It is very difficult to make an accurate prediction, especially about the future.
If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.
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.'