...separation of the observer from the phenomenon to be observed is no longer possible.

Every word or concept, clear as it may seem to be, has only a limited range of applicability.

There are things that are so serious that you can only joke about them.

Not only is the Universe stranger than we think, it is stranger than we can think.

The solution of the difficulty is that the two mental pictures which experiment lead us to form - the one of the particles, the other of the waves - are both incomplete and have only the validity of analogies which are accurate only in limiting cases.

Nonsense. Space is blue and birds fly through it.

An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them.