Of course, relative citation ...

Of course, relative citation frequencies are no measure of relative importance. Who has not aspired to write a paper so fundamental that very soon it is known to everyone and cited by no one?
 Abraham Pais

Quotes from the same author

The rule of the game was never assume that anybody, however honorable, would be able to stand up under torture. If Mr. X, who knew where I was, was caught for some reason, I should move.
 Abraham Pais
One of the absolute rules I learned in the war was, don't know anything you don't need to know, because if you ever get caught they will get it out of you.
 Abraham Pais