Prediction is very difficult, especially about the future. - Niels Bohr

"How wonderful that we have met with a paradox. Now we have some hope of making progress."

"Prediction is very difficult, especially about the future."

"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."

"Stop telling God what to do with his dice."

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