Vegetarian food leaves a deep impression on our nature. If the whole world adopts vegetarianism, it can change the destiny of humankind.

There is no vaccine against stupidity.

What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion.

The best that Gauss has given us was likewise an exclusive production. If he had not created his geometry of surfaces, which served Riemann as a basis, it is scarcely conceivable that anyone else would have discovered it. I do not hesitate to confess that to a certain extent a similar pleasure may be found by absorbing ourselves in questions of pure geometry.

Everyone should be respected as an individual, but no one idolized.

The process of scientific discovery is, in effect, a continual flight from wonder.

There is no scientific antidote, only education. You've got to change the way people think. I am not interested in disarmament talks between nations . . . What I want to do is to disarm the mind. After that, everything else will automatically follow. The ultimate weapon for such mental disarmament is international education.