Prediction is difficult, especially the future.

If you aren't confused by quantum mechanics, you haven't really understood it.

Everything we call real is made of things that cannot be regarded as real.

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

An expert is a man who has made all the mistakes which can be made, in a narrow field.

You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.