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.

One should respect an honest person even if he expresses opinions differing from one's own.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination.

The world is not full of evil because of those who do wrong. It is full of evil because of those who do nothing.

When a blind beetle crawls over the surface of a globe he doesn't notice that the track he has covered is curved. I was lucky enough to have spotted it.

Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.

The economists will have to revise their theories of value.