If you have never failed, you have never tried anything new.
Great spirits have always encountered violent opposition from mediocre minds.
I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.
No scientist thinks in formulae.
A model should be as simple as it can be but no simpler
The stakes are immense, the task colossal, the time is short. But we may hope - we must hope - that man's own creation, man's own genius, will not destroy him.