The only rational way of educating is to be an example. If one can't help it, a warning example.

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.

I like the Swiss because by and large they are more humane than the other people aming whom I have lived.

We are here for the sake of others

Happiness, as a pursuit, is suitable only for pigs.

But could not our situation be compared to one of a menacing epidemic? People are unable to view this situation in its true light, for their eyes are blinded by passion. General fear and anxiety create hatred and aggressiveness. The adaptation to warlike aims and activities has corrupted the mentality of man; as a result, intelligent, objective and humane thinking has hardly any effect and is even suspected and persecuted as unpatriotic.

It takes a touch of genius - and a lot of courage to move in the opposite direction.