There are some things so serious you have to laugh at 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.'

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

The very nature of the quantum theory ... forces us to regard the space-time coordination and the claim of causality, the union of which characterizes the classical theories, as complementary but exclusive features of the description, symbolizing the idealization of observation and description, respectively.

It is very difficult to make an accurate prediction, especially about the future.

A physicist is just an atom's way of looking at itself.

Opposites are not contradictory but complementary.