Conscious man, to be sure, has at all times been keenly aware that life is an adventure, that life must, forever, be wrested from death.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

The formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.

The mere formulation of a problem is far more essential than its solution, which may be merely a matter of mathematical or experimental skills. To raise new questions, new possibilities, to regard old problems from a new angle requires creative imagination and marks real advances in science.

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.

If I had only one hour to save the world, I would spend fifty-five minutes defining the problem, and only five minutes finding the solution.