Life is like riding a bicycle. If you want to stay balanced you've got to keep moving forward.

I wouldn't want to live if I did not have my work. In any case, it's good that I'm already old and personally don't have to count on a prolonged future.

Our entire much-praised technological progress, and civilization generally, could be compared to an axe in the hand of a pathological criminal.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

I am neither especially clever nor especially gifted. I am only very, very curious.

The stupid are invincible.

Failure is success in progress