My scientific work is motivated by an irresistible longing to understand the secrets of nature not by other feelings.

But there is another reason for the high repute of mathematics: it is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain.

One is born into a herd of buffaloes and must be glad if one is not trampled under foot before one's time.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

It is not a lack of real affection that scares me away again and again from marriage. Is it a fear of the comfortable life, of nice furniture, of dishonor that I burden myself with, or even the fear of becoming a contented bourgeois.

How vile and despicable war seems to me! I would rather be hacked to pieces than take part in such an abominable business.

Gravitation is not responsible for people falling in love.